For blogs other than yours?
You have to admit:
cooklikeyourgrandmother.com
is a LOT hard to type and get right than:
clygm.com
And given the Tweets/SMS/IM character limits, shorter is always better.
I know you aren't going after the IM/SMS crowd, but it never hurts to plan ahead in case you NEED it. Considering the price per year... $1/month or less, is it really *NOT* worth having it at least reserved? (or owned but not used)