Pandora Kind of a mainstay on any phone these days. I listen to it for hours on end. I find myself using it in the car more than my radio or iPod nowadays, especially when using navigation. It's nice to have the audio for the navigation break in, rather than having to turn my stereo down so as to not miss the nav alerts.
Jorte I have tried most of the calendar widgets out there and I just tend to favor this one for the widget. I use this for my month-at-a-glance view displaying the full month then have Agenda Widget above that just to display my four soonest items on the agenda.
Beautiful Widgets This was my first paid app and I haven't regretted it. It doesn't add a ton of functionality, but it's nice. It's also nice to have a link to the calendar, alarm clock and weather right on my main screen. Ton of skins, a lot of customization.
CIDR calculator I'm lazy...
Movies Just being able to change up my Netflix queue on my phone is reason enough to have this app; I'm one of those that will have a movie I want to watch pop into my head, then forget by the time I get to a computer. The rest of the functionality is pure cake.
The Weather Channel App I love the app. Ton of information, easy access to a radar, the ability to add multiple cities and swipe to move from city to city is nice. I don't have a bad thing to say about this app. I have heard some like Weatherbug better, but I have a bad taste in my mouth when it comes to weatherbug from my time in tech support. Everytime I see it the term plague jumps to mind.
3Banana It's pretty ticky, but the thing that kept me away from every other notepad-y app was; if you create a link to a note onto the home screen, then delete the actual note in the other apps, the link on the home screen stays, then crashes when you try to launch it. In some cases, the note would actually launch, even after you deleted it, but didn't show up in the apps list of notes, even after a reboot. No such trouble with 3Banana, and it's a great little notepad app. Backs everything up to snaptic too. No complaints, it does exactly what it needs to.
Handcent The best messaging replacer app for my money (free!). Tons of bells and whistles. Even when you turn off those bells and whistles, the features are quite deep. When I got it I spent several hours over the course of several days playing around with the way I wanted it to look and behave.
WordUp! and Pobs are the only two games that have a permanent place on my phone. When playing WordUP! be sure to keep in mind that the thing seems to have been made in the UK somewhere; words like Sot, Git and Loo are recognized, where they would be left out of an American made version.
Mint It's actually a great tool, but it's been ridiculously laggy and slow to update, it's still a great means to keep up with the money in your accounts, or lack thereof...