Indispensable homescreen widget for showing your calendar and tasks. Insanely customisable, too. Used to use the free version but it’s such an awesome app, I switched to the paid one some time ago.
Not the most polished app (or icon) but a very handy program to set and quickly change profiles of basic settings like ring tones, screen brightness and other settings.
A lightweight scrobbler for Last.fm. Works on stock player as well as Music Mod (and other music players that support it).
The default messaging app used to be a little lacklustre visually and chompSMS is a nice drop-in replacement. (If you stare at the application icon long enough, the chat bubble with the smiley starts looking very sinister.)
Sorting, backing up and restoring your browser bookmarks should be a built-in feature but sadly isn’t. This handy app (which is also available as an ad-free paid version) fills that inexplicable void.
Great for QR Codes, logos and (apparently) landmarks, Goggles lets you snap a picture and do a visual search with it.
I am not a not a big fan of battery draining battery widgets, and I greatly dislike the default icon with the settings’ shortcut for battery usage. Smart Battery Monitor fills this gap quite happily for me.
Small, lightweight and charming in a geeky Android way, this widget displays the time on your homescreen in the Clocktopia typeface.
When I don’t feel too geeky about time and yearn for some analogue warmth, I use the only decent clock widget with (gasp!) an animated second hand.
A terminal emulator for communicating with the OS shell, it’s a handy tool for power users and tweakers. No shortcuts for auto-completion and retrieving older commands, but I’m just being fussy.
A screen capture tool for rooted devices. Convenient and easy to use if you’re on a rooted device. Did I say this only works on rooted phones?
Updated 12 May 2011:
Currently using Elelinux’s Gingerbread ROM. I’ve stopped using DialerOne as I’ve gotten used to the stock dialer.