Some registrars such as GoDaddy will suggest new domain names if the one you want isn't available, but you have to admit, a .biz or .info top-level domain (TLD) isn't the best choice for any business or personal URL.
Panabee, on the other hand, will show you quite a few interesting variations around your preferred URL or keyword. Better still, it can show you the URLs of your competitors for that keyword.
For example, a Twitter friend recently said he wanted to "be the CEO of something about goats." So we plugged "goats" into Panabee. Not only did we see that great URLs such as OGoats.com, LeGoats.com, NuGoats.com, and even Goatsly.com and Goats.ly (which are dangerously close to the name of a certain distasteful Internet meme) were available, we also saw that our would-be CEO had some competitors already buying domains such as TheGoats.com, Goatz.com, MyGoats.com, iGoats.com, Goats.io and GetGoats.com.
Leaving aside any questions over why so many goat-themed URLs are taken, Panabee did a great job of quickly and succinctly showing us the Internet landscape of keyword-relevant URLs with both the traditional .com TLD and a wide range of trendy or at least plausible alternate TLDs.
Panabee can also show users related terms, web search results and social media postings containing the given keyword or keywords, just to give you a little extra inspiration.
If you take the more common startup keyword -- "social," for example -- you might have a difficult time finding any URLs containing that word. Panabee, however, shows us that Social.us is available. So are Sociality.me and Socialitsu.com, as seen via the related terms.
Once you find the perfect domain name, Panabee can direct you to GoDaddy for a sweet discount -- users pay $7.49 for .com and other domains.
Update: As of 12:30 p.m. ET Wednesday, Panabee.com appeared to be down.