[orionsbuckle]

i guess it really depends on the programs you are installing... like palringo, gyrator2, callfirewall, callcalendar and other programs like that, may slow your phone down but thats only beacuase they are constantly running in the background.

in my experience as long as you have more then half of your maim memory free it shouldnt make a difference. but the TP has a lot of memory so i havent had to use my sd card to install programs too like i had to with my mogul or my touch.

but if anyone knows the actual facts id like to know too...cus i have a lot of programs that i install onto my phone. thanks in advanced