Yup. Once you log in there's an import tool that'll import any standard Netscape bookmarks file, which is what Delicious exports as.

I'd mention that fact on the landing page. It seems more important than the domain name stuff (which I'd remove, personally).

It may be also a good idea to let people import their bookmarks and then make an account.

Edit: I see now that in the But... section you mention the import thing. I'd rewrite your main headings to be more persuasive. If one just reads the titles and the first paragraph then one misses the important stuff (as evidenced by my post).

Good point.

Nice resolution - helps a lot imo.