hey,
i started like you, i was a psion user for years in theory, well in practice i didn't use them for more than a year in total.. but i got my first psion in 2000 and the hpc arrived only in late 2004.
don't fret when you experience the first slowdown with your beautiful 720, when heavily multitasking lol
the hpc is so much more capable/functional than a psion in the long run.
anyway, please check out the support section for information on installing programs.