I don't really us my pocket pc much anymore, too bulky, (I wanna smart phone) but I've got a few recomendations for ya...
for checklists check out listpro
for spreadsheets get spreadce
Between these two products, you add a great deal of functionality. Especially spreadce... unlike pocket excel, this spreadsheet keeps most of the abilities of excel, I use this (or excel on my laptop more commonly) to keep a self totaling logbook, and I've put together a pretty decent weight and balance spreadsheet (so far only for R22/44
)
Check out
pocketpcthoughts for everything pocket pc.
have fun... josh