Problems with wireless internet on Imac

I have an IMAC since just over a year (MAC OS X vs. 10.6.6), and I have had over the last couple of months lots of problems with wireless connection.
Sometimes it connects without problem, but mostly I have to follow a 'Diagnostic Info' process: I select Airport, then select the wireless network, then have to restart, and then all lights turn green. I can connect then and only after a minute the pages do not load anymore.
Can anyone give me some troubleshooting tips ?

You could also have look at this thread: http://discussions.apple.com/thread.jspa?threadID=2790214&tstart=0
which has a couple of links I posted that may help troubleshoot your problem.
Rick's suggestion at looking at changing channels seems to be a good starting point.

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