A log of dates/times that a computer has been started up?

Is there a way to see the dates/times that a computer was turned on, like a log of some sort? This mac is running Lepoard and does not have a login screen, it just goes straight to the desktop upon startup.
I'd like to know if someone else has used my computer and asking them probably wont be a reliable way to tell ; )

I am sure there is a simple way to do it but cant think of this now.
You can use console (application/utilties) to see if there has been any activity which will probably let you know that at least it has been on and used.
Open console and go to File > New Log Database Query
Change the filter drop down to time and after (inset the date.time you know you last turn off your machine)
Click the plus sign to add another filter
and select time and before (insert the date.time to a few minutes before you just switched on)
If you get information in your query you know your Mac has been used.
Hope this helps. I am sure someone else will have a better suggestion.
Regards
Dan

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