Just a few things that would improve YAC overally:
1. Switch database to LevelDB - faster startup and shutdown, less chance for data corruption.
2. Increase number of full nodes that accept incoming connections - currently my node can't find even 8 of them after few hours online.
3. Use different wallet look and feel - check Silkcoin or N5coin, integrated blockchain explorer and statistics are just awesome addition.
4. Aliases - user creates an alias and assigns YAC address to it via special transaction, later to send coins to user one could just use alias instead of normal YAC address.
1. - I think that was done a long time ago
2. - I had 20 connections after 30 minutes and now 49 after 12 hours
3. - Great ideas, just need someone to volunteer to write them
4. - Seems problematic and memory intensive - everyone with an open wallet would need to be scanning all aliases on the off chance they're sending it to one. Plus, nothing like having alias squatters!

Has any coin implemented this?