I was going to just use firstnamelastname.com like many authors do, but my name is 13 letters and not particularly easy to spell.
I was thinking of doing it anyways, and getting one of those free redirection url services, creating an easy to remember url that points to it - I could give that to people who don't know me well enough to remember how my name is spelt.
Good idea?
If you only plan one book, consider the title as url. Or use just your first or last name, if available. The good thing about firstlast.com is that it is intuitive.
As for people guessing at the url, they are probably using a search engine. For typos, even on names, you often get:
DID YOU MEAN: Correct Name Spelling
Many people find sites by clicking on links on sites or search engines. Spelling is no issue here. Plus sometimes distinctive is memorable. Who used to spell lycos or altavista or...?
No one would have guessed how to spell M. Night Shyamalan either, but he seems to be doing OK :)