I think resigning a game shows a player`s chess knowledge.
People do not resign either they don`t see what`s going on on the table(this is the worst), or they wait his opponent to get an heart attack (this is hopeless:), or they play like computers (this is not that bad but people might call that player "computer guy").
Kasparov, Fisher, Tal etc. all of those great players resigned some of their games and they were still considered the world best players not losers :))
Here is just one example from Kasparov:
http://www.youtube.com/watch?v=_r1sM9Fvbms
He resigned at this game but he was still the number one chess player at that time.
If there's nothing I can do to at least get a draw then I resign. Anything else is hope chess.