This is a very good new for wordpress.com users. From now it’s possible to redirect your own custom domain for only 10 dollars per year and use it in your blog. The WordPress team takes charge of the whole adjustment process.
Besides, if you don’t have a domain, you can register in WordPress and add domain mapping for 15 dollars a year. The offer seems to be very good: free hosting that, even with limitations, is ideal for those that they don’t wish or cannot administer a web.
Source: WordPress