The best shareware archive out there for 68K Macs is the CD which comes with the book Macintosh Revelations by Ken Maki. It's the BMUG archive circa 1994 and has more shareware than you'll wind up using. It doesn't have everything (notably missing is Backdrop, a System 6 desktop pattern utility which has been discussed and linked to on this forum) but will satisfy your shareware cravings. The book itself is pretty good, but the CD is the reason it's so sought after these days.