im on a mbp revA with 2gb ram, running the system for almost 12 hrs now, i have:
pageins: 228k
pageouts: 48k
I run parallels winXP with multiple visual studio 2003/2005, office, and lots of other helper dev tools all day. also i run mail.app, transmission, itunes, & adium in osx simultaneously. i have seen parallels eat up ram even though i had it setup to use only 650megs for the virtual machine. i guess most of it is from parallels accessing the virtual hard disk file and the osx keeping pieces of it as cache in the inactive memory. suspending the parallels VM will also increase the pageouts since it is similar to putting osx to sleep, instead its sleep for winXP in the vm.