Jim Buzbee, of batbox fame and one of the original NSLU2 hackers, apparently gave a presentation about the history of slug hacking at the Boulder Linux Users Group. A PDF copy of his presentation can be found on his batbox.org site.
Jim also notes that Linkys are ending production of the NSLU2 after four years of life. Better get your hands on a few now before they all disappear – or end up at twice the price on ebay.