Speaker for the Dead and Xenocide

These two books have been perfect reading for the last week while it's been so hot. You all recommended finishing the series and I've enjoyed it so far (although I agree with Melissa that Speaker is better, at least than Xenocide). I liked Speaker better than Ender's Game, unquestionably. I've got Children of the Mind ready to go next.

I'll try Ender's Shadow sometime, I think. Thanks for your recommendations!