Everybody who is working with CAD is looking forward to any software that can read and write DWG files and has at least LT functionality in Linux. The market is especially interesting right now because Distros like Mandriva, Linux Mint, Ubuntu and the future Google System make it very attractive for anybody to switch to Linux. Applications like OpenOffice, Gimp (although still some work needs to be done here), VLC, MythTV, Songbird make a fully functional system out of Linux PCs, whether you use it for private or commercial purposes.
Currently what's holding back a lot of architects, engineers and even designers is the lack of a real working CAD system.
So go for it! You might be first!