Intel based iMac Seems to Be Getting Slower

I have one of the recent Intel based iMac's. Everything seems to run fine but the system is starting to slow down. I doubt it's mechanical, I do IT work for a living so I'm probably much more sensitive to it then most people are. I'm just wondering what might be causing it? For example system startup seems to have gotten noticeably slower since I purchased back in may of this year. Normal application use seems the same, but if I run a old powerpc based game, I need to restart the machine after I close it, otherwise the machine crawls.
The system has the latest OS updates, 4GB Ram, 2.8GHZ processor, Geforce 8800GS 512MB. I'm using a wired Apple Pro Keyboard (white keys, right before the aluminum release), Logitech MX518 Wired Mouse. The 4GB of ram is not standard, but a matched pair of 2GB chips from Other World Computing.
I use a program called Xslimmer to weed out files I don't need to save space. I don't have any really large files on the system, just thousands of smaller photos & documents. Free space on the hard disk is 318.79GB. I have 3 login items: CoverSutra, iTunes Helper, and EyeTV Helper that run automatically on startup.
Any suggestions? Should I consider an application like Drive Genius, Spring Cleaning, etc? I did install the Logitech Control Center (don't know how to remove it) but I don't use it, it's not in my startup items, and doesn't see the mouse anyway.
Thanks!

Try starting without the eyeTV stuff. (I've noticed my Macbook which used to shut down in exactly 3 seconds now takes 8 seconds, and this began the day I installed eyeTV).
I would then try starting without CoverSutra. You need to eliminate things one by one.

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