I have a xperix x8 with android 2.1
Hi there - welcome to the forums. Hope you find this place useful!!
You may get a better answer from the sub-orum for your device - Sony Ericsson Xperia X8 - Android Forums
I am unsure, but think that APPS2SD may only be an option if you are rooted. Other Xperia users will be able to confirm this!
To install apps to your sd card requires both the developer enabling that option and 2.2 (FroYo).
Separate names with a comma.