At SitePoint we have a program called Triple Time where we work on non-work stuff for 3 days a month. Lately there have been some pretty cool projects coming out of it, and we're super excited about the latest creation, which we've named CAPN.ME
CAPN.ME allows you to grab a photo from anywhere and add a caption to it before posting back to the web. You could add smart-ass captions to your friends' Facebook photos and share them back to their wall! You could caption your own photos before putting them up on Instagram. The possibilities are endless.
We'd love you guys to check it out and see what you think. We'd also be keen to hear any feedback that you have (or bugs that you notice).
You'll find capn.me here.