You should look at www.softwareadvice.com -- they have an entire website that provides the pros and cons of different software packages. Software Advice has "customer service consultants" who walk you through the process of narrowing the field of applications by using a phone interview. You can then set up demos with the vendors you're interested in -- Software Advice gets paid by the vendors to provide leads, so the service is free for users.
If you've been using Constructware and like using a web-based solution, you may be shocked by how primitive some of the older client-server applications (e.g., Prolog, Expedition) feel. I have been told that some of these companies position their web-based offerings as "temporary" offerings until they can get the customer to migrate to a client-server app, with all of the hassle and expense that implies.
Check out the newer web-based applications as referenced in EADOCS' post, including products from eBuilder, Procore, and EADOCS. Those companies have been continuously upgrading their applications over the past year, unlike Constructware.
Software needs to be continuously improved to take advantage of new web technologies, advancements in devices (think smartphones like the iPhone and Blackberries, for example). Given the statement from Autodesk that development is "not continuing", it seems fairly obvious that the product is being end-of-lifed.