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Torben
Depending on your area it may also be the competition checking out if your site is in there :)
I would tend to think that HitProf's response is more accurate. I use this feature in the Google Toolbar all the time, I've not yet upgraded to 2.0 and probably won't until forced to do so, don't need the extras just yet.
webdevsf, have you been entering your URI into the toolbar? If so, and you've not filtered for visits from your IP then you may be seeing your own searches. Entering a URI in the toolbar presents you with four options (usually).
Show Google's cache of www.example.com
Find web pages that are similar to www.example.com
Find web pages that link to www.example.com
Find web pages that contain the term "www.example.com"