Items that are ~~stricken~~ were resolved in Gecko 1.9

UX

XUL/UI Toolkit Visual Enhancements

glow (gradient?) border effect
throb effect
animation of UI elements
smooth sliding
zoom/shrink effects
gaussian blur effects
fade in/out
- enn: some work done on DOM/CSS manipulation, was slow; SVG?
~~smooth drag and drop w/snapback and "ghost" preview effects~~
- enn: this is in nightly builds
~~ability to insert rich formatted & image content in context & drop-down menus~~
- enn: see bug 279703, which could enable this, and is already blocking-1.9
~~opaque and transparent XUL overlays that contain active UI~~
- enn: <overlay> tag implemented on all but Mac atm

~~ability to theme differently based on OS version (ie: XP vs. Vista)~~
ability to change the theme without restarting (bug 134260)
Possibly more new XUL controls
- mfinkle: Maybe I am reaching here, extensions want the same kind of UI's that are possible with modern DHTML toolkits.
- mfinkle: Perhaps we should treat this as a separate library, like FUEL, but for controls.
Integration with Windows systray and OSX dock (bug 325353)
- mfinkle: patch for systray exists
~~Complete the Growl integration for nsIAlertService on OSX~~
GKO-008c Linking Content/Chrome Frame Trees -
- mfinkle: This will allow extensions to display chrome over content very easily (bug 130078)
drawing on the content area and not having any lag when scrolling the page
- XUL templates within XUL templates (already possible?)
- XML/SQLite-backed XUL templates
  - shaver: especially with the advent of cross-site XHR.
  - shaver: could be exposing a scriptable SAX/JSON parser to content, which we could then FUEL-wrap to provide template-like behaviour
  - shaver: Object,encodeAsJSON and String.prototype.parseJSON might fit in there too.