Have a few 2nd hand D30's, good site, it shows condition and also price.
I bought my second hand D30 through London Camera Exchange in June 2002. I payed £999 body only + 1 X 32MB memory card.
The camera had no scratches, no dust on the CMOS, no nothing, as Colin said, it was absolute mint...was well chuffed.
Have had no problems at all, had to go back to Canon for CMOS cleaning but that was through my lens changing not down to the fact it was 2nd hand.
As others have said, you could do alot worse than to pick up a used D30.
Dan, LCE have a 2nd hand D30 in 'Good' condition for £899...thats a good price.
I know there is the D60 and the other new Canon DSLR's out soon but if you want a decent digital for a good price a 2nd hand D30 is a very good buy