Multiple Sitemaps

Currently I have two sitemaps....

One is the generated by the VBSEO plugin, another is generated for the mediawiki mod I have...


Will I get punished by SE's for having more than one?

I believe google will take RSS feeds as sitemaps is it a good idea to do this as well?



Also I'm introducing a PHPMYDIRECTORY install for the location my forum is based around, I plan for it to be preloaded with 20K+ records, is this a good idea? (this will also haev a site map)

As long as the wiki is in its own directory VS the forum, there's no issues. 1 sitemap per directory is legal.