On this site, you can learn Japanese from the comfort of your iPhone or iPod touch.
The following links are useful in the Japanese learning process:
Veoh iPhone (Search for the series "Let's Learn Japanese" and it'll play With the quicktime plugin)
Kanji Converter (Not optimized for iPhone or iPod Touch, but it'll still work. Just enable the Japanese keyboard on your device)
Takanori Tomita Sample Textbook The audio file accompanying this sample textbook may be found Here (*Please note this may be removed if I am not allowed to distribute it)
Below are some useful PDF files I made from the website http://www.freejapaneselessons.com/ *Please note that these were made a year ago (Copyright 2007-2008), so if you want up to date material please see the site!
If you are studying for level 4, 3, 2, or 1 of the JLPT (Japanese Language Proficiency Test), Click Here for study resources (please note that not all resources are optimized for the iPod Touch/iPhone).
Another website that may aid your Japanese studies is www.iknow.co.jp. Some features will not work on the iPhone or iPod Touch because of lack of Flash support, but is very useful when you have access to computer and have a break from your busy lifestyle or just want a few notes to read in your devices web browser.