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I've also noticed people using coding in the meta tags that ask robots to come back every few weeks, does this really work?
I've been looking at Google's site map info, only catch is I have to look into whether my server uses Python and to figure out some of the little details. Perhaps I read that you shouldn't use a sitemap if you have a message board or anything else password protected on your site.
G sitemaps are now encouraged by G and I've so far mainly only heard neutral or good things about it. We've not bothered to do it, as all the pages we want found by G are being found and spidered regularly. But soon we'll probably have a look at it.
If anything, I find it harder to keep pages away from G than to get them spidered at all. Those clever little bots can find just about anything, including pages only linked to from your hard disk. ;-)