New domains: plesksupport.nl and plesksupport.org

Last weekend, I registered the domain plesksupport.nl and today I registered the domain plesksupport.org. At this point, my colleague and I are looking into the best ways to provide content for these sites.

The idea is to make community driven sites, using something like Mambo and phpBB. Both should be fast and search engine friendly.
Mambo can be made SEF with a built in option, but I don’t like the URL style, they don’t provide enough information on the requested page.
phpBB can be made SEF by adding a set of functions and rewrite rules. If anyone knows any good alternatives, please contact me using the contact form.
Thanks!