I guess I will go first. I am only listing 3rd party apps from the App Store, since I am not jailbroken:
10) Here I am ( I use this to email directions to my friends with iPhones)
8) Speed Dial (1,2,3 and 4) Speed Dials from the Springboard
7) Motion X GPS Lite
6) GPS-R GPS tool with location reminders. If you get near say Block Buster, it will remind you to return the movies you rented if you program it to.
5) Billy Frontier
4) Air Share
3) Weather Bug - decent and fairly accurate, but the advisories with no description are a pain
2) Jaadu saved my ass a couple times being able to remote into my home PC
1) Crash Nitro Kart- great time waster, no matter how often I use it.
10. Katra Weather (JB)- more of a theme than an app.
9. Units- conversion on the fly comes in handy for my job
8. Status Notifier (JB)
6. Trace- great free game, no reason not to have this one
5. Path Tracker- like to know exactly how far I've gone when walking the dogs
3. Sol Free- probably my #1 time waster
2. BossPrefs (JB)
1. QuickGold (JB)
I have to update my top 10 as ive changed some things... some key things on my iPhone today. and looking at this list... in no particular order... only Jaadu, BeeJive and Orb are from the app store. To me, jailbreaking is a no brainer.
10. Easy Writer (Appstore) - Love the landscape emails
9. SplashID (Appstore) - I love having my junk organized.
8. Facebook (Appstore) - What can I say, I network a lot.
7. Whitepages (Appstore) - Brilliant little free app, works well (Even has reverse lookup)
6. Todo (Appstore) - This is the Appigo version that syncs with RTM and Toodledo
5. Holy Bible (Appstore) - Gotta have the greatest book ever written with me.
4. Sportstacular (Appstore) - Probably the best realtime sports resource for iPhone
3. i.TV (Appstore) - I use this program everyday, love the TV Guide + Movie Trailors
2. Billy Frontier (Appstore) - I love this shooter, play it all the time
1. Pandora (Appstore) - When I am not using my phone, this is almost always playing in the background.
--- Now I should do a top 10 of my favorite cydia apps ...
8.)now playing - great app for movie times, theatres, trailers, etc.. (free)
7.)jellycar - hilarious and fun little game (free)
6.)wordle - challenging word game (free)
5.)sportacular - best sports app (free)
4.)simplify media - listen to music from your pc on your iPhone, cool and works well (free)
3.)the weather channel - new weather app, very nice, even has video forecasts for your area that are updated every 30 min, best weather app IMO...and I've tried almost all of them (free)
2.)iWeathr - this is actually a web app. animated radars, lots of them. reflectivity, rainfall, velocity, aviation weather, lightning strikes, satellite radar, tropical weather. If you like weather radars you have to get this. I think I got it from dribbr.com (free)
1.) is a tie between: Bank of America - I always have an eye on my money, lol. (free)
SayWho - voice dialer (free)
chord play, rjdj album, ocarina, everest, rsoccer09, bugdom, billy frontier, flipbook, espn camera man, etc... those are all really good apps too
10) Idicto-Recording app(appstore)
9) Remote (appstore)
8) Fake Calls-Gets me out of boring meetings..MUST HAVE APP,LOL (appstore)
7) Tideapp-Great for fishing or checking the beach tides(appstore)
6) Beacon-Find your car App (appstore)
5) Say Who-Speed DIaler (appstore)
4) Remote (appstore)
3) Sharam-Tells you the name of a song and the artist (appstore)
2) Pandora (appstore)
1) Ultimate Easy Relax-I sleep about 4 hours an evening,this has helped me get more.... sometimes...(appstore)
1. Splash ID
2. Google Mobile search
3. Pano great panoramic photo stitcher
4. 12-C Lite best RPN calulator
5. iSSH great telnet app I use for remote router work
6. Who auto-dial
7. MotionX GPS Lite
8. Shazam song recognition