Hi mate there is a thread roaming about round here saying what u can remove but just be careful on what u remove as it mat start acting weirs and also I use titanium but I mostly just freeze things I think I might end up using again
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First please use search, or look around:
Second you can restore everything back by reflashing system.img withouth losing data.
Freezing the app is definitely the way to go, at least to begin with. However, while this will stop the app from loading & using up RAM this wont recover internal storage from your phone, so if youve used the phone for a week or so after freezing with no issues then you might want to delete the frozen apps.
But: If you *do* decide to delete an app make a backup of it first (this will copy it to sd card so it wont take up phone storage) in case you do decide you need it back at a later date.