The Humble Bundle model is pretty amazing. Not only do you get a shedload of games for a cost that you can decide yourself but you also get the added value of altruism with a part of your donation going to charity.
This time around the good causes are the World Land Trust and Extra Life and giving them a few quid also bags you six games, with more to be unveiled in the very near future.
Pick any price for cutesy flying thing Buddy & Me, calmish puzzler Lyne and adventury puzzle title Doodle Kingdom. And pay more than $4 to net three more, including Sorcery! 2, King of Dragon Pass and OTTTD. The whole pack is quite adventure/RPG heavy, but that OTTTD looks like a nutty tower defense thing that's bound to confound your tapping fingers.
So head over here to get more details on the pack and to also pay your monies. If you like mobile gaming and you have an Android phone, there's really no reason not to.
And doon't forget to check the main Humble Bundle site for book, gaming, comic and mobile packs every week.