Google has posted some new guidelines, and one point about site maps is that they should contain less than 100 links. I wonder if this can be modified to spread over a number of pages?

With so many links on one pages, this makes it look like a Linkfarm, and search engines don't like those. Listing 50 posts at a time would make the Googlebot more happy.

I havent had any problems with over 1,000 links on a page :)

Depends on your PR as to how many will get crawled...

well it definetly worked on my sites. I have tons of hits from the sitemap everyday, but I checked my server log and JUST the sitemap.php file is using almost 3GB of bandwidth a month. Any way to gzip the output and possibly shorten it to only include a hundred or so links?

can i make it also for only categories

or only the newest 50 topics?

I checked and even your sitemap (the one on the 1st page) is almost 1MB in size. That's a ton of bandwidth.

I dropped the file in vbfolder/sitemap/index.php and changed ../global.php but nothing seemed to work. Any idea why?