Just got one for Mrs. Fierro -- seems pretty slick, except for some inexplicable reason they've gotten rid of a calendaring feature ("floating appointment") that she uses a lot.
There's a lot of cool 3rd party apps for it too, many free.
check out the discussion boards on
treocentral.com
portal.treobits.com
mytreo.net
also check out
freewarepalm.com
palmopensource.com