Today, on the official Linden blog, you find three tools to solve common Second Life problems.
First one: Second Life Viewer cheatsheet (by Kippie Friedkin)
This is GREAT! If you dedicate half an hour to familiarize, you will save hours and hours every month, thank to your ability to use shortcuts and keyboard combinations!
Second: Avatar Databank with UV Mapping info
If you play a lot with avatar clothing, this one can be your dream!
Are you seating somewhere? Good, now hit this: this tool allows you to submit an URL, and then copy the linked video in a format that Second Life accepts (mov).
Good! What are you waiting for? Test them, and let me know if you have any suggestion!