File a "Citation of Prior Art." It's very easy to do, and anyone can do it.
Next, file a Request for Reexamination. There are two kinds of reexaminations: Ex Parte (which means you submit the request and the fee, and then your personality responsibilities are terminated), and Inter Partes (which means you have a say throughout the entire re-examination). The latter is more expensive. Here is a link that may help you get started:
http://www.uspto.gov/web/offices/pac/mpep/documents/2200_2210.htm#sect2210
Since your work was listed as prior art, you are going to have a very tough time ahead of you. That designation means that before the patent was granted the examiner looked at your work and said "IBM's invention was not obvious from the prior art."
If you are unable to cite your own work due to it already being cited in the patent, you could try citing the work that predates yours by twelve years (and also mentioning your previous work as well).
[Disclaimer: I am not an attorney, and I am not a patent agent. I'm not giving you any legal/non-legal advice, just some ideas that you might want to talk to a patent attorney/agent about.]