Mark Shuttleworth just announced the HUD, which is sort of like Synapse, but for app menu items. Personally, I’m looking forward to this in Precise (if it lands). Compared to the traditional menu, discoverability does take a hit in the HUD (at least in its current form) and Mark does admit as much. However, the Inkscape example in the video is interesting. Fuzzy matching and prioritising is rather sweet.
I’d also imagine this to work really well in applications where you’re already spending a lot of time on the keyboard: text editors, word processors and terminals come to mind. Great to see Canonical pushing forward here.