I just got a (virtual) visit from the IRS:

Domain Name		(Unknown)
IP Address		152.216.11.# (INTERNAL REVENUE SERVICE)
ISP		INTERNAL REVENUE SERVICE
Location		Continent  :  North America Country  :  United States  (Facts) State  :  District of Columbia City  :  Washington Lat/Long  :  38.8933, -77.0146 (Map) Distance  :  2,072 miles
Language		English (United States) en-us
Operating System		Microsoft WinXP
Browser		Internet Explorer 6.0 Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; .NET CLR 1.0.3705; InfoPath.1)
Javascript		version 1.3
Monitor		Resolution  :  800 x 600 Color Depth  :  32 bits
Time of Visit		Dec 28 2006 7:20:28 am
Last Page View		Dec 28 2006 7:20:28 am
Visit Length		0 seconds
Page Views		1
Referring URL		http://www.google.co...q=blattner pipe bomb
Search Engine		google.com
Search Words		blattner pipe bomb
Visit Entry Page		http://blog.joehuffm...mbmaking Expert.aspx
Visit Exit Page		http://blog.joehuffm...mbmaking Expert.aspx
Out Click
Time Zone		UTC-5:00
Visitor's Time		Dec 28 2006 10:20:28 am
Visit Number		123,064

They did a search on Google for information on a pipe bomb case and found this post where I commented about being quoted by a newspaper on the case in question.

I wonder why the IRS is interested. It's possible some folks at the ATF show up as within the IRS on because they share the same block of IP addresses or something (the ATF used to be entirely within the Department of the Treasury). But I find it more amusing to believe the IRS thinks there is money to be collected from people involved in the manufacture and sale of pipe bombs.