Two semi-serious issues with 21.5" i5 iMac...

1.  The AirPort internet connection stalls out.  When I'm using Safari or Chrome it just acts like the computer isn't connected to the internet.  Sometimes the upper-right icon drops to two bars when this happens (it's usually five), and sometimes it doesn't.  Then I'll turn the AirPort off and on again, and it will work.  On two occasions it took about three times of doing this for it to work again.  This happens daily.
2.  I just got a message prompting me to force quit an application because there wasn't enough startup disk space or "application memory" to keep running all TWO of them.  I was running iTunes and Safari.  I was actively using Safari (reading wikipedia, so nothing too demanding), with iTunes "hidden" playing songs from a playlist.  I just got another one while typing this.  EDIT: just before I submitted this question I got about five more of them in a row.
3.  In general over the last two days it has been running much slower than it should.  I was using Google Earth with iTunes playing in the background and the graphics were extremely choppy and it kept glitching/freezing every few seconds.
My iMac is about 2.5 weeks old, and I'm positive that all the software is up to date, as I just checked with the Software Update application.   What should I do???

The Airport issue sounds like interference, which can be from any number of sources: microwave ovens, other strong, nearby signals, cordless phones etc. Try switching to a different channel. Adjust the router antenna or move its location, if possible. Might also try rebooting the router.
For the other issue, first just try restarting. Sometimes this will help for system "glitches." If that doesn't help, then open Activity Monitor in Utilities, go to System Memory and see how much free and inactive RAM there are when you get these messages or things are slowing down. Also, look down at "page outs" and "swap used." With only iTunes and Safari open, and not having run anything else memory intensive before, you should be seeing zero for both. Are you sure you had no other applications still open?
The Google Earth issue sounds like, maybe, your internet speed was dropping out
Still in Activity Monitor, switch to CPU>All processes and see how much idle CPU there is.
Another general thing to try is Verify Disk in Disk Utility in Utilities.
Your Profile is showing 10.6.7, and you say all software is up to date. Try applying the 10.6.8 Combo update in Safe Boot. You can run this over the current 10.6.8. It might fix anything that's damaged or missing in the system files.
http://support.apple.com/kb/DL1399
Have a look at my recommendations for updating.
https://discussions.apple.com/thread/3139323?tstart=0
Finally, you might want to run the Hardware Test in Extended.
http://support.apple.com/kb/ht1509
Message was edited by: WZZZ

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