Be careful about mixing packages from 2009Q2 with source installs from 2009Q3. What if xfce4 in 2009Q3 was compiled with a different, newer version of glib2. Rather than sorting though all the packages you have installed the last 2 days I would consider blowing away what you have and re install NetBSD so you start adding packages from scratch.
A lot of factors weigh into the decision to do binaries vs pkgsrc installs ie slow vs fast computer and internet connection, size and number of packages you will ultimately want.
If you decide to do pkgsrc installs I followed these
instructions