I want to be able to draw in Kanji like you can with IME in Windows. Anyone know how?
I don't think you can on the current Mac OS X. I believe that Ink (the handwriting recognition) only works for European languages. The iPhone OS has glyph recognition for Chinese, so maybe a future version of the Mac OS will support handwriting for Asian languages.
Apple announced recently that Mac OS X 10.6 will have kanji handwriting recognition. http://www.apple.com/macosx/refinements/
About halfway down the page on that link. Not a solution for 10.5-, but something to look forward to.
The Mac OS X input method has a lot of limitations. It only works with the newer laptops with the multi-touch trackpad. (My system is from 2007 and it doesn't work with it, even though it supports two finger multi-touch. It may work with Wacom tablets too, but I'm not sure.) Because of this, I haven't used it myself, although I've used the iPhone Chinese input method. The iPhone input method seems to have limitations with respect to Japanese. It is described as being for Chinese, and it seems to have trouble with certain Japanese characters. I suspect the desktop version has similar limitations.
The shareware program JEDict (http://jedict.com/) will do recognition (Look in the "Kanji View" window).
Not very convenient, but good for one-off kanji lookup.