cachemate is a good one..prob the best about that one is the scheduler. ..however there are tons out there..currently i use "cache cleaner NG" (l. sartory) it does a really good job. also a widget so you can clean with just a press..which also has a scheduler, also cleans the sd card. another that i have noticed lots of people like bc they like app2sd is aCCleaner by Sam lu. its not bad its main feature i feel is that when you open the app it shows each of ur apps running and what they are using etc...however it doesnt do as good as a job as the one ksmith mentioned and "cache cleaner" ..hope that helps a bit.