Links

ONLINE REFERENCES

Jim Breen's - WWWJDIC home (Online dictionary and database)
Denshi Jisho - Another online dictionary using the WWWJDIC database, a bit more aesthetic than Jim Breen's (and a little more user-friendly)
Talking katakana chart - This chart talks so you can hear the pronunciations of the characters. Some are yelled a bit weirdly, though :)

ONLINE LEARNING TOOLS

Skritter - Tool for reviewing kanji.