I'm working at Cascaad (@cascaad).
We're building a realtime personal information engine to distill from
noisy conversation streams the tweets relevant to a user’s current
We've developed a web site to show our platform in action, an iPhone
application and lately we released some free API.
There's the chance to enrich tweets using our API and get semantic
entity markup, nonintrusive in-text affiliate commerce links, related
content, social relevance scores and more.
This can be an interesting feature to add to a Twitter client.