I'm specifically looking for good (and hopefully free) interactive lessons on UI design using Photoshop and Illustrator.
For PS, nathanbarry.com/photoshop looks good, but I'm wondering if there are any solid free alternatives out there.
For AI, a good book I've stumbled across is "UI Design in Illustrator" (2012). I still prefer learning this via video/interactive form though.
Thanks in advance DN community :)