With many more people coming online, there are a lot of similar ideas
for domain names. If your domain is taken in the .com, you have the
option of registering a .net, .org, or a limited number of other TLDs,
which includes country code TLDs (e.g. .US).
Now ICANN has opened up the possibility of multiple new TLDs to allow
for 'vanity' TLDs (see announcement here:
http://icann.org/en/announcements/announcement-4-26jun08-en.htm).
Although the new possibility may not be available until early 2009,
once it starts, there will be many new TLD options that may cater to
everyone's needs, especially those with specific target industries
(similar to .travel today).
Look forward to new online storefronts next year!