This has probably been all over the internet already, but I just found out about her yesterday. Basically, she takes self portraits of herself jumping. Pretty self-explanatory but the results are awesome.
"Lives in Tokyo with two cats. Photographs mainly levitating self-portraits (and cats not levitating). yowayowa is a Japanese term meaning "weak" or "feeble." Since I'm yowayowa, it's really heavy to carry SLR cameras around."
Her about page has more info on her process.