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Receptional_Andy - 10:24 am on Oct 29, 2008 (gmt 0)
For some reason I don't see this as an option when creating a new alert, but if you go to the Alerts management page [google.com] you can choose "edit" and then "deliver to" to select RSS format for existing alerts. For those not using Google alerts, give them a go, they're useful ;)
For those using Google alerts, you may be interested to know that you can now get these delivered in RSS rather than email format. Very handy if you have a lot of alerts running and don't want them clogging up your inbox.