RSS is ideal for recruitment sites, real estate sites, travel sites, etc. basically any site with updating content where people search for information!
On the RecruitIreland site, I like the fact that you can get RSS feeds for the advanced searches however one failing of the advanced search is that you can’t filter for jobs over a certain salary threshold (“I wouldn’t get out of bed in the morning for less than…”).
With the recent launch of IE7, RSS is increasingly becoming mainstream. Soon having a site without an RSS feed will be the equivalent of having a toy without batteries – it might be nice to look at but it won’t do anything for you!