thats because some apps dont support our qvga resulution. its maybe written for wvga or something. its kinda stupid,cuz most of this apps automaticly resize to your screen,its part of android OS.its just developers being a bit lazy.i speak from experiance,say reckless racing game-its meant to be played on larger screens but plays just fine on my g5.no cut off-s or anything,its perfectly scaled.
so search here for some other great to-do apps:
todo - Search Android Apps on AppBrain
or just try to find taskos apk file and manually push it to the phone