For inspiration I have found the following website to have one word or short name domains that for one reason or another have not been renewed.
I am not sure how this site works but I suspect it must use an algorythm to collect its information.
Upon scanning its list I found some good domains. If you are fed up of thumbing through the dictionary or having a bright light idea only to find that is gone, this may be a good site to start with.
I do not know how often this site gets updated so don’t just take my word for it that these domains are available, thats up to you to find out.
Anyway here is the website: http://www.justdropped.com