Just kegged a Vanilla Porter from AHS last night that I'd cold crashed for 48 hours as opposed to my normal 24 hours. The yeast cake was MUCH more solid, so much so that within two seconds of stating the siphon, the beer in the racking cane was free of any visible yeast as opposed to 7-10 seconds. The end result was that I ended up with more beer than my Corny keg would handle and had to fill four bottles.
I'll be kegging a Czech pilsner next week, so it will be interesting to see how well it clears it up with the additional time in the keezer.