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Here's some global warming scepticism:

Global Warming: That Pesky Data
Posted by Steve Verdon at 14:31
Looks like Mann et. al. [1998] could be getting some major attention before too long. Apparently the Committee on Energy and Commerce is interested in the Hockey stick.

Letter to Dr. Mann, Dr. Hughes, Dr. Bradley, as well as letters to the National Science Foundation, and the IPCC. What are they asking for?

Your curriculum vitae, including, but not limited to, a list of all studies relating to climate change research for which you were an author or co-author and the source of funding for those studies.
List all financial support you have received related to your research, including, but not limited to, all private, state, and federal assistance, grants, contracts (including subgrantsor subcontracts), or other financial awards or honoraria.
Regarding all such work involving federal grants or funding support under which you were a recipient of funding or principal investigator, provide all agreements relating to those underlying grants or funding, including, but not limited to, any provisions, adjustments, or exceptions made in the agreements relating to the dissemination and sharing of research results.
Provide the location of all data archives relating to each published study for which you were an author or co-author and indicate: (a) whether this information contains all the specific data you used and calculations your performed, including such supporting documentation as computer source code, validation information, and other ancillary information, necessary for full evaluation and application of the data, particularly for another party to replicate your research results; (b) when this information was available to researchers; (c) where and when you first identified the location of this information; (d) what modifications, if any, you have made to this information since publication of the respective study; and (e) if necessary information is not fully available, provide a detailed narrative description of the steps somebody must take to acquire the necessary information to replicate your study results or assess the quality of the proxy data you used.
According to The Wall Street Journal, you have declined to release the exact computer code you used to generate your results. (a) Is this correct? (b) What policy on sharing research and methods do you follow? (c) What is the source of that policy? (d) Provide this exact computer code used to generate your results.
Regarding study data and related information that is not publicly archived, what requests have you or your co-authors received for data relating to the climate change studies, what was your response, and why?
One of the long running problems with looking into the Hockey Stick has been getting data and code out of the authors (Mann, Bradley and Huges). As I have noted previously there seems to be a pattern with regards to climate scientists and their willingness to share data (and contrary to claims in the comments to that post, not all the data and source code has been shared).

The issue here isn't so much whether there is anthropogenic warming (there probably is some, how much I think is still somewhat of an open question, and the effectivness of various policies even more open), but the integrity and accuracy of the research that supports the climate change hypothesis. If the data are not avialable, if the original source code is lost, and/or the authors are unwilling to share (note: that in a Wall Street Journal article [Feb. 14, 2005] Mann has said he wont be intimidated into releasing his algorithm) this is a problem.