LStack - bookmarking webapp written in CodeIgniter

[eluser]Unknown[/eluser]
Hi,

I'd like to share with you my weekend project written in CodeIgniter - LStack (http://lstack.com/).

I think of LStack as a "smart bookmarking app", because in addition to saving bookmarks, it allows you to annotate them with tags and custom parameters ("smart tags"). Example applications - saving product page and price (price:199 USD), storing YouTube video with genre and artist name (genre:rock, genre:grunge, artist:nirvana). See more examples at (http://lstack.com/about/). You can use tags and smart tags to filter bookmarks.

I've just started to develop it so in future new functions based on smart tags could be implemented (like Digg-style link publishing queues / sites, defining link streams to publish via Twitter / Facebook, etc.).

What do you think of the application? I'm wondering if anybody could be interested in additional, "premium" (paid) features. Do you think something like LStack has a chance to become a business not just hobby? Or maybe should I consider selling application code?