I'd agree that the UI is fantastic, the best I've found in any P2P client... I can't see many other necessary refinements, mind you I don't think Etzi has been spending all that much time refining it because I've seen very few changes since I started using Qtella... just some extra fine tuning to the system. He seems to have been doing a lot of work on the guts of the system..

The most evidence I've found of multisegmented downloading (he never mentioned swarming I belive) is that I can group searches by sizee so it groups the same files in a tree-like structure, but I'm not sure if it's actually downloading from all the discovered sourcesat once.

It will be nice when ultrapeers are implemented. It'd also be really cool if a C programmer had a hack around with the Qtella code to see if he/she could find any improvements to its guts, because I'm sure staring at the code looking for improvements isn't the most entertaining or productive use of Etzi's time...