Hah. No the server is definitely not self-destructing, but it is physically very difficult to get to.
They would have to make quick work of a subpoena, as I only keep logs going back a week (only a 4gb hd in the server). The only web server logs I keep past that are external referrer logs (who got here from where).
The first amendment covers pretty much everything on this board. It is not illegal to share your opinion or criticize public officials.
A web site being subpoenaed for the identity of one of its users is extremely uncommon and widely reported on by the likes of slashdot.org, the AP, etc. Also, subpoenas against websites are almost always based on a copyright violation of some sort, no file sharing goes on here. I can think of only a handful of non-copyright related website subpoenas. A prominent one involves a list posted to a
http://www.indymedia.org/ server which contains the hotel addresses and phone numbers of prominent people attending the Republican National Convention. The ACLU represented the ISP/indymedia and to this day the list is still available for download. Article here:
http://yro.slashdot.org/yro/04/08/31/210234.shtml?tid=103
I also can't think of any case where a site was actually subpoenaed by a local government instead of the federal government.
If I were to be subpoenaed tomorrow, the first thing I would do is call the Electronic Frontier Foundation
http://www.eff.org for some pro-bono work and take their advice from there. I would also scan copies of the subpoena and make sure the big names like Slashdot and ArsTechnica are aware of the story. I would resist giving any information for as long as possible. They can't just steal my server as all the logs past 24 hours are encrypted. Oh, and I'd post everything here so everyone is aware.