Open source microblogging platform Identi.ca, which launched 5 days ago to a big splash, is already evolving with the addition of a replies tab.
The basic feature allows users to see who has responded to them on Identi.ca, bring the service one step closer to Twitter...well, while Twitter has replies working today anyway. Some reports have Identi.ca passing the 10,000 user mark over the weekend, a decent start for a brand new service.
On the Laconi.ca front, the code behind Identi.ca that also supports the OpenMicroBlogging platform, a number of Identi.ca compatible clones have already popped up. There doesn't seem to be any serious competitors yet with most sites appearing experimental (and in my practice, not always working perfectly), but 5 days in, it's a start. Some sites to check out