Windows 7 is scheduled to be released to the general public in October. Fortunately, as a Microsoft partner, we have had access to the RTM (release to manufacturing) for some time now. I have been using Windows 7 for almost a month and can say I have experienced no issues. In fact start up and shut down times have been dramatically reduced (factor of 5?). This is important for me because I bring my laptop everywhere.
The product works as promised. We have begun the process of converting our developer machines from XP to Windows 7 (64 bit) allowing them to take advantage of memory that is well over the 4GB limit with XP. All of or developers are running MS Office, Visual Studio, SQL Server, and a smattering of other development tools like TOAD for Oracle. With all of these applications running, the memory can get gobbled up quickly. The benefit is faster reponse time and quicker compiles for large Visual Studio projects. If you are considering the change, I encourage you to make the leap ... this one is worth it.