My guess is if the Sony Play interface and Sony apps were removed, this would save up to another 100mb. I already have all the PSX games working that I need, so no need for the Sony apps.
My goal would be to be able to swap microsd cards with different games on them and not have to bother worrying about app issues due to apps2sd or the adb app push process. This is very problematic- if you swap cards, as I would. I appreciate some games load data files on the card, but this is not the same issue as the core of apps being on the card.
I could have all of my PSX games on six microsd cards. Label them all as follows:
1. Shootemups
2. Action
3. Sports
4. Puzzle
5. Fighters
6. Racing
Some would be 16gb cards and some 32gb (already have enough microsd cards).
added:
Is there a clockwork recovery for the Play yet?