as you might probably know, YAHOO and MSN joined the Google Sitemaps program, see this posting at TechCrunch.
I've updated my XML-Sitemap Generator Plugin (formerly known as "Google Sitemap Generator") to the new Sitemaps.org XML namespace and fixed some smaller bugs.
The most important change is the memory usage which is now about a fourth compared to the last release and should solve many memory-limit errors, timeouts and white-screen-after-posting errors.
You can download the new beta version (3.0b4) HERE. Please note that it's not compatible to the Alpha version of WordPress 2.1 yet (if anyone is already using it).
Please report if you still encounter any white pages after posting, how many memory the script uses (the amount is displayed in the log if the server supports it) and how many posts you have.