I'm tired of them, too. However, here are a few areas where I think building a Twitter app can be useful.
First, if you take advantage of the fact that a semi-interesting Twitter app can get lots of press right now, you can use it as a way to promote your real money-maker app. For hackers, it's probably way more fun (and cheap) to spend a day building an app than sending 50 Emails to bloggers begging for a post.
Second, if you truly do it on your downtime for your the pure joy of imagining something and seeing it come to life. Wasting time is relative, it's more productive than watching TV, playing WoW or Xbox, random web surfing, etc...
First, if you take advantage of the fact that a semi-interesting Twitter app can get lots of press right now, you can use it as a way to promote your real money-maker app. For hackers, it's probably way more fun (and cheap) to spend a day building an app than sending 50 Emails to bloggers begging for a post.
Second, if you truly do it on your downtime for your the pure joy of imagining something and seeing it come to life. Wasting time is relative, it's more productive than watching TV, playing WoW or Xbox, random web surfing, etc...