Choosing the right domain name

Sometimes to choose the right domain name for your blog or website can be very complicated. I don't know how about you, but once I write music the hardest thing for me is to name the track. Of course you want to get the name directly associated with your business or something you do. But once you go to any domain registration site and check availability all of them are taken already. If you really find the one you like, just type in to your browser and see what pops up. If it is allready business, go look for another one. If your search ends up with domain parking site you can do enquiry. If it comes up 404 error site or your browser can't find it- just search for WHOS and contact the person with your enquiry. Easy? Yeah, sometimes we looking for the hard ways while forgetting the easiest things.
The most important thing in your domain name is- your name has to be relevant and associated with the business you do or product you sell. Lets say you selling sofas. There is no chance sofas.com will be available (.com is still he most common and popular domain extension). But you can look for sofastore.com ar sofa-store.com (or simply try to swap extension to .net or whatever you like). Try to find it most relevant and short as possible name to something you do.
Once you found one, go and do some research. Look at google keyword tool to see for searches ("phrase" and "exact" gives you the best picture of searches made monthly). In this section you can find other keyword suggestions but, as the other suggests don't bother about the ones which are less then 1000 searches a month, I strongly advice you to count for every keyword possible. It might be seasonal. Lets say "christmas gifts". How many of as will search for it summer time and how many before Christmas? The difference can be enormous. Does it makes sense? Yes, it does.
Next free tool you can use for your domain name research is spyfoo.com
Tip: 
if you can't find the right one for you, just type in web domain of your competitor (which you can find again by typing in the search engine the most relevant keyword for you) in keywordspy.com (another free tool for your research) and look for best positioned keywords within this domain name. Try all the combinations until you find one available. Once found just check again for the monthly search date and buy it.
Tip for Google's adsense publishers:
before you start to look for the domain name look in keywordspy.com how much for the keyword (which one has to be included in your domain name) is paid. Why go for the cheap ones $0.5 PPC (price per click) if you can get, let's say, $6-10 per click. Does it makes sense?

Another option- you can go to ebay and buy one you like;)

Happy hunting for profitable and keywordrich domain name!