I'm sorry I missed this discussion when it was started a decade ago, and I'm sorry that the links above are broken, but I'll add my comments now for the record. I published a paper about pie menus in the proceedings of 1988 ACM SIGCHI conference called “An Empirical Comparison of Pie vs. Linear Menus”, in which we measured…
After the Indiegogo campaign failed I started working on UniPie in my free time. Now it's in a semi-usable state with the core features working but also having one outstanding bug: Key combos sent to Photoshop and Illustrator are misinterpreted. For example CTRL+G becomes CTRL+SHIFT+WHEELUP. o_O Stuff seems to be working…