Anything similar to this useful little tool?

[Emoni]

Japanese Flip - Home
Kanji Flip - Home
It's a simple program, but a friend showed me today and I was amazing on how good it is for simple quick review. Even sectioned off with JLPT levels.
I don't have an Ipod or anything, and don't expect this runs by itself on a computer. So, I was wondering if there were any similar programs online that are effectively the same for vocab and kanji review with features that remember which words you have problems with, explain details and more.
Thanks to any useful recommendations!

 

[tada]

Looks pretty similar to Kanji Box, it's a facebook app. Contrary to the name though, it also teaches vocab and kana. The kanji/vocab are also sectioned off by JLPT level.