I do know how difficult it is to learn another 3D modelling tool when you are used to using one already – it takes a lot of effort to change and very few manage it.
Although I work with 3D Canvas I am always happy to promote other tools – for me, the production of good models is more important for the hobby than the tools used.
Mr 75027 (no one knows his real name ) has been writing an export plugin for FSX for the free XSI Mod tool- http://adventuresinmodelling.spaces.live.com/ definitely worth keeping an eye on this.
I was a little saddened to learn that XSI has been bought by Autodesk a few weeks ago – they own 3D Studio and bought Maya last year, now XSI. I always get nervous when companies buy out competitors, Corel did it a few years ago and we lost a few good 2D paint packages.
If I can finish off the FSX aircraft tutorial Doug and I are writing before christmas, I may find some time to do a bit fo work on and FSX export (scenery objects only) for Sketchup.