incrediBILL - 4:58 pm on May 31, 2011 (gmt 0)
The best use of the $100 is purchasing booze, purely for creative writing purposes ;)
Sign up for some forums, make useful posts, people will look up your profile and follow you to your blog. Get a twitter and facebook account, write some useful stuff and promote it for free.
I've never paid to promote a site with paid links yet, drank the booze though...