Web Services Product Comparison?

I'm searching for technical information/product comparisons - but not finding much useful information.

Does anyone know of a list of the main categories and providers of Web Services products?

I'm really looking for a list (and comparison) of the Enterprise Service Bus vendors.

However, there's a few other categories that are useful to look at if a list comparison is available (security, BPEL, SOAP stack vendors like Systinet, Web Services management, etc)

Also, if anyone can point to technical product reviews ....

please search at http://www.developer.com/ and http://searchwebservices.com. I believe you can find some of your answers here.

Originally posted by RR Kumaran:
please search at http://www.developer.com/ and http://searchwebservices.com. I believe you can find some of your answers here.

I've also already looked at webservices.org, web services architect, looselycoupled, etc.

I can't find solid product reviews or product comparison matrices.

This is a list of Community Members of WS-I.org

and Advocates.

Not exactly a review or product matrix .. but you can run through the capabilities of the WS-I compliant offerings.

One of the Advocates might have a survey.
[ August 25, 2005: Message edited by: D L ]

So far as I know, no such survey exists. No vendor will ever do one, because it will either (1) show up their weaknesses, or (2) cover the truth. No industry consortium or consortia-run website will do one for the same reasons - each constituent vendor will protest such a move.

AFAIK, the only way to proceed is by reading each vendor's product specs and, where possible, trying the products out. This is a real pain - and very slow - but I've not yet found a better solution.

The upside to this is that by trying a few different platforms you get to know standards like WSDL really well.

-Tim