IMac Spinning Beach Ball

I just bought an iMac about 4 months ago and it already is getting beach ball spins of up to 1 minute long. If I wait the full minute it stops and everything seems to go back to normal, until a little later in the day when it does it again. It will do this at least 3 to 4 times a day. I have over 100GBs of free space in my Hard Drive, 4GB of Ram....I've tried different Ram sticks. I can't pin point it to any specific application either. It is starting to get really annoying. I've done repairs on the disk and that hasn't done anything. I've also tried to check the disk with the repair utility in the install disk.
Can anyone assist me on what this could be? I'm new to macs and I am a little puzzled if this is normal behavior?

I would recommend reading this article:
http://www.thexlab.com/faqs/sbbod.html
It should give you some insight into what's happening and how to prevent the beach balls.
We really can't tell what is happening because you haven't provided much information. Next time please let us know what applications you are running and what you were doing when it began. Also we have no idea what the configuration of your iMac is so please complete your profile.
Regards,
Roger

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