A large number of links related to thermal physics may be found at Daniel Schroeder's web site. It is well worth browsing here. There is also a useful list of errata for the textbook.
Brownian Motor: Test whether you too can move molceules up the hill at http://monet.physik.unibas.ch/~elmer/bm/
For a recent paper on how random thermal energy can be used for motion in one direction in a system of two molecules, see T.R. Kelly et al., Nature, 401, 150 (1999) (September 9 issue)
The Maxwell-Bolzmann Distribution: http://oobleck.chem.upenn.edu/~rappe/MB/MBmain.html
Monte Carlo simulation Java webpage: You need netscape 4.5 or higher to view this: http://www.ph.biu.ac.il/~rapaport/java-apps/index.html The critical temperature should be 2.27 (in units of the interaction energy)