Here is a list of my favorite 3rd party iPhone apps that I’ve accumulated among my iPhone history.
Best Streaming Media Application:

ZumoCast allows you to stream audio or video to a browser or to your iPhone app. So you can use it on your iPhone and your laptop browser. The reason ZumoCast came in ahead of other apps is because you can download and upload any files remotely as well as stream any type of media (including flac files). Coming in at a close second for streaming media was Stream2Me, which is also highly recommended but duplicates the functionality of ZumoCast. I also mention EyeTV below which is a fantastic service.
I have a Mac Mini hooked up to my TV with an external hard drive that contains all my music, movies, ebooks, and tv shows. When I want to access those the best application I’ve used is ZumoCast. If you also have a Mac Mini hooked up to your TV, you should definitely check out these other iPhone applications: Plexures (remote for Plex which is fantastic), iTV (tv guide for the iphone), TouchMouse (wifi mouse), Remote (control iTunes media player), VNC (control your whole computer remotely).
Best Mouse Application:

I’ve tried and purchased a few mouse applications for the iPhone and the best one is the FREE logitech touchmouse. The controls are fantastic. It allows two finger scrolling and when you’re sitting on the couch and want to control your Mac Mini on the tv it is the best option.
Best iPhone Game:

So yes I’ve played Angry Birds, Doodle Jump, Geared, Live Poker, and TouchGrind and every other game that’s came around. The only game that has lasted more than a month is Galcon. It’s the most amazing game in the world. It’s a game based on logic and technique. You can buy the free version to get the hang of it, then you can purchase the paid version to play online against other players. Try it and love it.
Best Sports App:

You would think ESPN would have won this battle hands down but surprisingly Yahoo wins best sports app with Sportacular. You can choose your favorite teams, set alerts, and even predict games to see who’s football IQ is the best. Highly recommended.
Best iPhone RSS Reader:
When I have spare time I like to read Google Reader. I subscribe to a lot of different design and tech feeds to stay up to speed with current trends. Although I wouldn’t recommend an iPhone as the best outlet to catch up on RSS, when you are bored and need something to read it can kill some time. I have a tie in this field. These two apps have a similar user experience so they are both pretty good. I think I’m going to lean towards GoReader over Feedler if I had to make a decision. GoReader splits up all your RSS groups, folders, and individual feeds and has a pretty clean interface.
Best Messaging App:

HeyTell wins this battle hands down. I’ve tried a couple different applications for messaging. IM+ is good for gChat, Yahoo, and AIM. Skype COULD be good if they would have the option to disable chat history. Since I use Skype for work once I log into the app, even on wifi, I have to wait 10-15 minutes for the chat history to catch up. HeyTell is like an audio text message. The other recipient needs the application also but it is available for iOS and Android. This app is great while you’re driving because it eliminates the need to type. You just hit record and it sends the message.
Best organization applications:

The iPhone has some applications that help keep you organized. The apps I find helpful are Evernote, Wunderlist, and Toggl. Evernote is a popular app to save notes. You can save text, image, or voice notes. There is also a desktop version of the application which syncs with the iPhone. I use it whenever I come up with random thoughts I want to remember. Wunderlist keeps me out of trouble with my girlfriend. Whenever I have something I need to do I put it right into Wunderlist. With Wunderlist you can create to-do lists and to-do tasks. So I have a to-do list for work, personal, bills, and I had one for Christmas presents. Since I’m a computer programmer sometimes I do freelance projects in which I get paid hourly. I use Toggl to track all my projects and how many hours I’ve been working on them. Toggle also has a desktop client and can tie into Jira as well. These 3 apps are extremely helpful in keeping me organized.
My personal favorite app:

EyeTV is my favorite application because it allows me to watch my home TV from my iPhone. So I never miss any college football or any other show I want to watch. I can also set EyeTV to record tv shows from my phone then they are saved to a folder that ZumoCast indexes so I can watch recorded TV shows on ZumoCast. This works when I’m sitting in my office and I want to watch a show or if I’m out of town and want to watch Dexter.
Every iPhone should have:

Google Voice is the most amazing application ever. It allows you to send text messages from a browser or your iphone application. It will take a voicemail and transcribe it into text so you can read your voicemail instead of listening to it. From a browser you can also send/receive text messages which is better than messing with your phone while you’re sitting at a computer. Everyone should have/use Google Voice.
Honorable Mention:

The only reason I’m mentioning this application is because it rated me as the sexiest person in the room. So I know the algorithms that scan facial structure are coded perfectly. The fact that my friends Jo and Ryan made it has nothing to do with my honorable mention. So go check out The Ugly Meter.
Let me know if you found any other applications that trump the applications I listed or have some additional you think I’d enjoy let me know!