In my experience people that talk about what they're working on don't finish anything. Come back a year later and they'll have some new grandiose project and a handful of excuses for why the last thing didn't pan out. I have a personal rule that I take very seriously, which is: don't tell; show. People will write you off as a flake and a blowhard if you are always talking about what you're working on. (I learned this lesson the hard way :)
