Kind of silly, but why does Wombat come with options for kernel 2.6.10, but does not contain the source. However, it contains the source for 2.6.12. Granted it's easily upgraded, but it's kind of like buying a gasoline car and getting the user manual for a diesel truck. Easily fixed, but confusing.
"Wombat" being the install CD? Please understand, arch is not a versioned distro like you're used to...
If the installer has options for 2.6.10, that means that's what's on the install CD. If you did an ftp install, your kernel is going to be updated to the current kernel (2.6.12)... run a uname -r to verify what kernel you're running?