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Does Google have anything like Yahoo's notifier?
Would be really nice to be able programmatically let Google know when a page has been updated.
Google will handle frequent re-submission of full XML Sitemaps, up to once per hour:
6. Setting up a recurring script
We suggest setting up Sitemap Generator to run as often as your content is changed, to a maximum frequency of once per hour...
You can use an HTTP request to let Google know about changes to your Sitemap. However, please make sure that you log in to Google Webmaster Tools with your Google Account once to manually add your Sitemap to your Google Webmaster Tools account.
Doing this on a regular bases will "teach" Google that you have new content and with a high enough PR (+PR3) Google will soon "learn" to visit your index page for that new content regularly.
With a PR4 site of mine, Google now visits the index page at least 2 times per hour and index's the new content right away, often mixed with existing content links.
This only works if you regularly have new content (ahh, and by new content I mean real content). However, this also works with currently indexed pages that have minor updates mixed in with new pages, again, as long as the content is real. The existing content will get a fresh looky-see from Google.
I hope this help.
Also, regarding the Yahoo! API, read this: "The Site Explorer APIs are limited to 5,000 queries per IP address per day and to noncommercial use."
Both wipe me out, so I am not reading any further. Be even if they did not, I really do not have the time to program for Yahoo! traffic, it is truly a waste of time: effort vs. benefit just do not match up with Yahoo!
[edited by: kamikaze_Optimizer at 9:12 am (utc) on Dec. 7, 2008]