I have some apps that I love. Here you go....
Quickclock....great app....calibrates to YOUR phone and tells you safe overclock speeds. Did wonders for my batterlife.
Appinstaller....I don't know if I actually need this anymore but I keep it for installing APK's that I can't get from the market
Astro file manager....wonderful app. Let's you copy, rename, move files and much more.
Beautiful Widgets....dude...just buy it. This app is insane....tons of widgets and plenty of customization options....LOVE IT. Best weather and widget app out there IMO.
APPtoSD.....great app. Notify's you of movable apps and moves em. What else can I say?
Droidforums app....because this site ROCKS!
Appbrain....gives you the ability to view your installed apps online...also allows you to push apps to your phone...apply new wallpapers from website that gets pushed to phone. Also VERY handy for replacing apps in case of phone replacement or wipe. Market sort of does this too but mostly with paid apps. Appbrain does em ALL. It also shows you how many apps you have installed, allows you to share your list with others, and even shows you how much you have spent on apps.
LauncherPro....great app. Gives you 3D app drawer, several home screens with ability to add to your dock bar....and tons of other customization options. MUST HAVE.
Mototorch....basically turns your phone into a flashlight with a very useful widget
Android Infiltration....just shows you how many people with your device are running Gingerbread...so far zero so I have nothing to be jealous of.
Arcmedia....media player for video's and doesn't require them to be compressed. I play 1.4g MP4's on my phone....talk about making idont owners jealous.
Phone Silencer....this apps is only seen when you put your volume to vibrate....it will pop up asking you when you want it to return to full volume.
Quadrant Standard....free app just for gloating about how fast your phone is. Basically runs benchmarks and gives you a graphical display of where you phone ranks against other popular Android devices....mine is always on top.
tTorrent....allows you to download torrents directly to your phone
Where's my Droid...this is an absolute MUST HAVE APP. lose your phone when it's on silent?....no problem...simply text key word to phone and it automatically sets your volume on high and rings for 5 minutes or until found.
FYI....ROM manager doesn't really work with the DX and D2's.
I can go on with more apps but I think that's a good start. I have 265 apps on my phone and use almost all of em....at some point anyway.