My email is handled by Google Apps for Business, and I just use e.g. dropbox@hemsley.cc or facebook@hemsley.cc - and have everything come to my real mailbox. Nothing to set up when I want to sign up for a new site. LastPass stores the different email addresses.
This works better than something+realaddress@gmail.com because many sites fail to handle/allow that 'format'.
I do this too. You get more spam with a catchall address, but Google get most of it. And there is no setup time lost with a new service - just use newservicename@yourdomain.com when signing up and you're away.
This works better than something+realaddress@gmail.com because many sites fail to handle/allow that 'format'.