Instaled Nitdroid Gingerbread on Emmc

Lot of aps running fine, but some crashing after a while
and won't let me install more apps saying low in memory.
i have roofs 23 MB free and home 134 MB free.

The question is:
I need more space and how much?
and what should I free up: rootsh, home
or I need to do something else.
???