Popular migration paths
As we work with more clients on SharePoint projects, and talk to several more prospective clients, we see some trends emerging. One is the migration off of a "free" tool to SharePoint. We have had clients request moving off of an Open Source tool (LAMP stack), or a DotNetNuke-type platform, or a single-purpose content management system onto SharePoint 2007. The common themes tend to sound like "We tried things out with this free tool, and made some progress, but quickly ran into limitations with it and realized that SharePoint did this better, and had many other abilities that help us tackle other projects. And we have Microsoft on the desktop, so we know it plays well with the server-side".
What we're hoping to see in the future is more people taking advantage of the MSDN license and some VPC's to set up a SharePoint installation for pilot projects. While the Open Source software licensing may be "free", a lot of time and money can be spent piloting a project on a platform that you end up scrapping. We haven't had anyone ask to move them OFF SharePoint 2007 to another tool, so please feel free to save some time and money by starting on this platform...