Yes domains are very important if you got your targeted keywords in your domain then i will be a + point from SEO point of view.
domain name can be important it also comes down to the optimisation of the site too and the title meta description. I have a blog philipbroadhead.org not keyword specific as it is about Motogp. Yet a quick search of Yahoo for Motogp 2011 and I am used to be no1 because of the effects of titles and meta. Although google tends to lead towards keyword specific domain names (although they say they don't)Â