I've got an Epson Stylus Photo 875DC printer, and the color nozzles
seem to be clogged. I've run the head cleaning utility repeatedly to
no avail. Are there any tricks to unclogging these nozzles?

hi boomering!
The following website contains very useful useful tips on how to
unclog the color nozzles. If you start from here
http://www.inkjetart.com/tips/cleaning/ you should find exactly what
you're looking for, if you follow the instructions by clicking on the
relevant links.
 
I have also listed the links here for your convenience:
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How to unclog an Epson printer --
Cleaning tips - http://www.inkjetart.com/tips/cleaning/
Some suggestions for unclogging your Epson printer -
http://www.inkjetart.com/tips/cleaning.html
Cog cleaning procedure - 
http://www.inkit.net/refills/instruct/clog.htm
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Other useful links:
Epson Stylus Head Cleaning Solution - repairs all Epson Stylus
printers (except for the C80) which don't print, or print choppy in
black or color.
http://www.fixyourownprinter.com/kea0.html
Forum for manually unclogging Epson print heads -
http://dealmac.com/forums/read.html?f=1&i=434891&t=433581
Troubleshooting help section at Epson's Web Site:
http://support.epson.com
 
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Search terms used in Google:
[  epson 875 stylus unclog ]
[ epson stylus unclog ]
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I hope you find these tips useful!
regards,
Jack