As I've posted somewhere on the forums recentley, the replay client found here makes watching a much more enjoyable experience.

Rather then selecting from the list the client gathers from the site, i wanted to watch an older game and the replay link i was entering was the one which launches the default replay client.

If you are ever looking for them, results are stored at http://fumbbl.com/results/###/<gameno>.zip where ### is the first 3 digits in the game number. (Although this doesn't seem to be the case for a 2004 game i looked up as a test so there may be exceptions).

Edit:

Older games use 2 digits for the directory so anything from 2004 can be found in a similar way. (http://fumbbl.com/results/38/)