I wrote one in php the other week. Took about 10 minutes. If the site is in a DB then its pretty straightforward. Using a 3rd party tool on a big site is not going to create the sitemap in the most straightforward way.
My personal opinion is that you should be generating the map direct from your database if you have any kind of content management system in place. How do you currently manage you 90k pages? If you have vBulletin I can direct you to a very good sitemap tool.
I belive the limit on a sitemap, is 50,000 urls. http://www.google.com/support/webma...57&query=maximum+urls+in+sitemap&topic=&type= Which I guess would mean you need to figure a way to separate the sitemaps out. So you can do more than 50k. Which involves a custom solution. Also, that many urls, you would want to manually generate the sitemap, rather than being dynamic(generated each time its requested). Pierce
that's a large site and the sitemap is going to be huge...you should split it up into smaller sitemaps and submit them all to google sitemaps
Thats 50k per file. There is one file for the index of sitemaps and another with the actual links. No real size limit.
No. You have one site map And the site map is constructed from an index and lists You only have one sitemap to submit to google and it uses the index as the master list.
I use this as mentioned above (sorry I am new no links for me) --> xml-sitemaps rocks so far ..I am always looking as well..