[InfinityX0]

SEOmoz's Fresh Web Explorer is a great substitute for Google Alerts, and it was launched partially for this reason. It's not instantaneous, but it allows you many of the same functions as Alerts, with a much bigger spread.

Tool: http://freshwebexplorer.seomoz.org Post with More Depth On Usage: http://www.seomoz.org/blog/announcing-fresh-web-explorer