You only need Zope-pcgi if the cgi calls need to come off of the same IP as the rest of your zope. If your Zope site is, say, www.mysite.com, then you could put your image cgi stuff into an Apahce responding to the an IP under the name of, say, images.mysite.com.
Thanks so much everyone for all the help...actually, I ended up still being able to use Zserver (without pcgi)...I left the cgi programs on my separate non-Zope site...and then for the image source, I just used a link to the site, with all the corresponding parameters to generate the picture...like so: <img src="http://www.mynonzopesite.com/cgiprogram?parameters"> This worked! So, I was able to keep the regular Zserver, and still do calls (at least for an image generation) to a cgi program residing on a completely different site...looks like I will stick with Zope now, since I am able to do this. :-)
What have you run into that makes you think there is a conflict?
When I would do "rpm -Uvh Zope-pcgi-2.1.4-1.i386.rpm" I would get the following message: "error: failed dependencies: Zope-zserver conflicts with Zope-pcgi-2.1.4-1 Zope-pcgi conflicts with Zope-zserver-2.1.2-3" But I no longer need pcgi, so I guess this isn't a problem for me anymore. Thanks Again, Jessica