The question has come up recently about migrating from 1.1 to 3.5 and I wanted to address it real quick.
(special thanks to Sean D. for inspiring this post)
There is no direct migration path from 1.1 to 3.5, however you can go from 1.1 to 2.0 then from 2.0 to 3.5. For a great article that discusses going from 1.1 to 2.0 check this one out:
From 2.0 to 3.5 the migration is a no-brainer because, both, 3.0 and 3.5 are based on 2.0. Here is a graphic to help visualize how this works:
While you are checking this stuff out make sure to visit these two links: