HTPC related? SageTV Mobile Web… although, it’s not an app, but a mobile version of the SageTV Web UI. It’s always cool being able to fix conflicts, schedule or cancel recordings or just check that everything is working okay.
Non-HTPC? I love the barcode scanners and, especially, using the for QR codes. Outside of that, I’m using Handcent SMS (IM client), K-9 Mail, Plume (Twitter), and My-Cast Weather.
I tried the Google Sky Maps and, while it was really cool, I quickly lost interest in it.
