The guide says 2008.0 is the latest profile. This is incorrect; the latest is 10.0. Reproducible: Always I"m going to be trying to use the Xen guide to get Xen working on my existing Gentoo system this weekend, so there may be a flurry of bug reports.
profiles are not mentioned anywhere in the xen guide, much less outdated ones. nothing else in /doc/en/ contains 2008.0 either, except the upgrading guide for migrating from that profile to something newer. marking INVALID; this is not a bug.
Ah, crud. I somehow got the wiki page confused with the guide.