Chris Pirillo, editor of Lockergnome.com, chose doPDF as one of Lockergnome's picks.
Chris is one of those that liked doPDF from the begining, as doPDF was one of his picks back in 2007 (February) when doPDF was launched: http://chris.pirillo.com.
I've also seen that PC World syndicates now Lockergnome's picks in one of their newsletter, so this means even more people heard about doPDF. Thanks Chris!