If you join
http://kanji.koohii.com/(free) you can see loads of mneumonics for kanji submitted by users. Many of them have On and Kun readings included, but they often feel forced.
However, these kind of kanji mneumonics tend to work best when you invent them for yourself.
And whatever about RTK1's method for English meanings, kanji readings are possibly best learnt and remembered in context, by reading (and writing) the real Japanese you already know. (imho)
(RTK purists probably also feel you need to follow the books in order I think.)
if you do want to try learning in context,
I think 3級編 例文で学ぶ漢字と言葉 (JLPT3 kanji by example)
http://www.3anet.co.jp/english/books/te ... kanji.html
is well worth using. Also it's companion volume for JLPT 2
If you own a Nintendo DS I thoroughly recommend Kakitorikun.
http://100mas.jp/kakitorikun/
and Japanese grade school textbooks or texts preparing for the kanken test.
http://www.kanken.or.jp/tosyo/index.html