The GDC slides ask for feedback but give no direction as to how to do so.
It would be great if PSGL was GLES 1.1+ compliant and PSGL 2.0 was GLES 2.x compliant. Fewer discrepencies in APIs make it much easier to develop on multiple platforms. At my company we work on next/current gen mobile, pc, and console products and it is is a constant struggle to keep cross platform libraries clean. Being able to move between things like ATI Imageon 238x and Playstation 3 (almost) seemlessly would just make life easier.