you have previous versions of Site Import and Universal Email. These will need to upgraded to the latest releases for CS5 compatibility:
Site Import 3.0.4
Universal Email 4.0.1
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.