I bought the 58th Ed. (2004) off half.com for just a few bucks, and it came in the mail last week. I haven't thumbed through it all that much since I'm in the middle of final's period at school, but this thing seems jammed with information. Tons of pics and close-ups of varieties. Kinda puts the Red Book to shame...
I absolutley agree, I have the last 4 or 5 years, and I buy any older editions I can get my hands on. I'll admit, I was a little disappointed wth the redbook when I got it. after reading charltons guide for the last couple years, nothing seems to compare