Reverse IP Lookup
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Whois Source has a pretty cool feature: Reverse IP Lookup. Enter an IP or domain and find out how many other sites are sharing the same IP. Requires 'silver membership' to see all the matching sites, but the free membership will tell you the number of sites that match. Good way to check if your hosting company is being honest about their semi-dedicated hosting!
Turns out the cheap (and reasonably good) hosting that I'm using for a project of mine, has managed to squeeze 183 sites onto the one box (for the cheap hosting - NOT the semi-dedicated one)!