Anybody who hasn't read Sirlins "Playing To Win" book needs to read it before SFIV hits.
http://www.sirlin.net/ptw
Having the right mentality before you play, will drastically improve your game, and success. Realizing that losing is a must when starting, is also very important. You WILL lose, and will lose ALOT!
I highly recommend everyone go here (
http://gootecks.com/ ), and download gootecks book on "The 3rd Strikes guide to SFIV". Even if you've never played 3S, you will be able to understand the guide, it is VERY helpful. Also, that site has podcasts that you can subscribe to, and other miscellaneous things for SFIV.
Anyone that isn't a member of
http://forums.shoryuken.com/ , go register now. The guides there, and people there will be helpful for the longterm of your SFIV playing.
This guy has alot of SFIV vids -
http://www.youtube.com/user/Min0ra . There's plenty of high level matches, and also other SFIV related thing there.
If you're going to be playing alot online, I recommend you sign up on gamebattles for the SFIV singles ladder (
http://gamebattles.com/xbox360/street-fighter-iv/ladder/singles/ ). Playing in tournament rules, and situations will further improve your game to it's fullist potential.
STREET FIYTAH FO SON!