You might have trouble with the Press This feature of WordPress. Here is a very helpful tip from aaronrogers on the WP support forums that explains how to amend the javascript to make the bookmarklet work. There certainly seems to be a problem with hostgator hosted blogs and this fix …er…fixes it!
I was having trouble with 403 forbidden and 404 not found errors.
I am posting this using Press This Reloaded plugin which lets you have access to the Categories, tags etc.
u=’+e(l.href.replace(/\//g,’\\/’))+’