There's a round-up of "the Best Web Application Servers" in this month's Linux Magazine (Nov - 8 ball on cover). It includes Zope and WebSphere. Its not really a comparison though, but it might give you some ideas. You could also get some ideas from Kemalus' "Guide for Corporate Decision Makers" (http://www.zope.org/Members/Kemalus/make_zope_dec ision). I'm no marketer, but if you could find a similar document on WebSphere you might be able to do a 'real' comparison. HTH, Rob