I'm very stingent when it comes to buying apps. I only buy apps if I feel they are the best one (for me) and after doing intesive testing with the same type of apps if they exist.
1)Docs to go - $5.55 - $29.99
. As stated by other users, if you use spreadsheets and powerpoints intensively, this is a good option. I'm not a big fan of the Words UI, it looks very ugly and not appealing compare to other note apps. If you're planning on getting this but you don't NEED it right away, I'd suggest you check their site often and see when they have their sales. The regular price is a hefty $29.99, but some promotion prices range from 14.99 to as low as 5.55 (that was how much I bought mine).
- 2.99 EU
. I wanted my note options to be so that I can do EVERYTHING. I tried the light version which has basic features (text note, paint note and QR note) but the Pro version really DOES have EVERYTHING: text note, paintnote, voicenote (big one for me), photonote, gallary note (really nice option since I'd like to put a note on a picture I took with the gallery camera, this is something that no other note app has when I tried them), checklist, durable checklist (running checklist that you can reuse), QR note, Gdoc note (syncs withyour gdoc).
System Panel: $2.99
. As other posters have stated, one of the best app management app. I bought it because I wanted to track my apps CPU usage and battery consumption history.
Widget Locker - $1.99
. I love that all of my favourite widgets are simply there without having to unlock my phone. I put my music widget and power control widget so that it's an easy two touches process (wake up phone and press on widget)
WidgetLocker Lockscreen - Android app on AppBrain
: still debating whether to buy since I'm on a budget at the moment.