Users' IP Stored in DB on login?

I've been going into the event viewer and deleting all events I don't want to save and leaving only the 'login success' entries, as I would like to save the IP address in the event I need to babysit the forums from time to time...had some spam fill the forums, so I use the entries with the filter to keep the riff-raff out. :)

Are these entries stored in the database somewhere would I could run a query and export them to, say, Excel or even a plain txt file? As I get more and more entries in the event viewer, it's becoming a pain in the arse to toggle everything except the login success entries to save them. If I clear all, however, I suspect the IPs would also be removed from the database?  So if such a query is possible, I would have to export the data BEFORE cleaning the events?

Perhaps there's a more intuitive way to clean house, but this is how I have been doing it since I started...anyone have a better method? :)

Thanks, John. Yea, the detailed site log is just what the doctor ordered.  I'll now just clear all the events in the event viewer after a cursory glance for problems.

This begs another question, though...when truncated the transaction log, is it actually clearing the detailed site log? I could see this site log getting exorbitantly large in a hurry.  Is there a best practice to keep it manageable, if not connected to the transaction log (or are the one in the same?)?