usually, a good google search will help you to find answers for questions like these (google, every man's best friend).
the easy answer is: explore2fs ... the downside to this is that you cannot write to the ext2 or ext3 fs from windows.....
there is an article located here: http://www.linuxworld.com/story/32941_p.htm
that touches on file access from linux to a windows partition and from windows to a linux partition. have fun and happy reading.