here's a thing I just found out. You can go on http://lodestone.finalfantasyxiv.com and go to Character Search, enter your name (or any other name) and find out detailed information on the character (Character profile). You have also stuff like character history etc.
For instance, a very useful piece of information (for me) is the shield skill. I'm at Sentinel rank 9 and I really wanted to see how much till Sentinel 10. I couldn't find this info in game (if it's possible, please let me know).
Just wanted to share, as for me it was quite a new thing, sorry if it's already mentioned somewhere.
Edited, Nov 8th 2010 5:01pm by griffonu