blog on blogspot .. if you have use so called blog promotion software then I would say that is the reason. Is this what you did?
Don't panic, (use any promotion) and you
could, may get back your listing.. but this could take some time, (3-6 month).
Read
Google reinclusion request and
Google banned and
reasons Google banned
Also see
Google Webmaster Tools and Google Webmaster Guidelines
How to submit a
reconsideration request for your site
Video tips