Law Librarian Blog is new and already quite useful - it has a post on tracking down free copies of Congressional Research Service (CRS) Reports. CRS reports are like super-charged Cliff Notes to the issues of the day, and I think they are usually the best source on the topics they cover. Good example: CRS report RL32608 (Sept 2004) gives great info on legislation concerning library records and the Patriot Act (and related legislation).
CRS Reports are written by very smart people for Congress ... "a 739 person, $91.7 million per year nonpartisan 'think tank' that works exclusively for Members and committees of the United States Congress." Law Librarian Blog (citing Penny Hill Press).
In addition to the sources listed at Law Librarian Blog, readers may also request a CRS report from their senator or representative. If you can get it that way, there's no charge.