In light of my Motorola Droid and HTC Droid Incredible review, here is what I'm using at the moment. I've got a bunch of other promising apps installed, but I've actually been using these. If you've got recommendations, I'd love to hear about them!
All of these are free unless otherwise noted.
handyCalc: A calculator designed by a geek. Built in unit and currency conversion, can define functions, graph, and more.
Google Listen: A solid podcast aggragator. A few rough edges, but plenty good enough. Far superior to the laughable system Apple ships.
OI Safe: Open source password safe. Could use some love (ability to search, any I have some concern over the encryption implementation), but still good.
Twidroyd: The official Twitter client is so-so, but Twidroyd is quite good.
ConnectBot: Recommended if you need a good SSH client.
Barcode Scanner: Fast and just works. Reads QR codes, but can also look up UPC and other barcodes.
K-9 Mail: An open source fork of the official Droid mail client, it's a solid mail client with lots of edge cases considered.
Evernote: Recommended if you're already using Evernote. The Android client gets better and better.
Apps Organizer: If you want folders of applications, this does a good job.
OI File Manager: You'll occasionally need to root around in the files on your SD card, and this is good at the job.
Droid Light: For Motorola Droids only, turns on the camera flash for use as a flashlight.
Tricorder: Amusing show-off toy that happens to work as a metal detector, wifi-access-point finder
OI Shopping: Serviceable shopping list app. I'm not actually all that fond of it, but I haven't found a better one yet.
RepliGo Reader: Costs a few bucks. A faster, better behaved PDF reader than the built in one. Reading PDFs on a phone still sucks, but RepliGo Reader made reading a book significantly less painful.
GAMES
Spaghetti Marshmallow: Entertaining physics building game.
SFCave: One button game. The Palm classic is back! It's faster, and the cavern moves instead of the ribbon, but it's still fun.
Shortyz: Very good crossword puzzle app that pulls puzzles from a variety of online sources, including several newspapers.
Bonsai Blitz: It may be a Zuma clone, but it's a good Zuma clone.
Update, 2011-12-28:
Tweetdeck: The Adobe Air version is mediocre, but the Android version is quite good. Also, since my original post, the official Twitter client improved. I stopped using Twidroyd some time ago.
NewsRob: A custom interface to Google Reader. Google Reader's mobile interface is quite good but requires an internet connection. NewsRob works well offline, making it useful if you need to kill a bit of time somewhere without network service. It also makes good use of the interface; I particularly like "swipe right to mark read, swipe left to mark unread" on the index. Good enough I paid for the pro upgrade.
Edits:
2010-06-28: Typo fix. be->been.
2010-06-28: Added K-9 Mail. How could I forget that!
2011-02-10: Added some stuff, updated notes, typo fixes.
August 18 2010, 11:34:18 UTC 1 year ago
free app
little and useful on my opinion android app is CallTrack It will store all incoming/outgoing calls into the Google Calendar, i mean not the audio record :) but a log.