Do you think that openTracker should incorporate theming/skinning in the future?
I don't see it as being a high priority or even one that should be tackled in the near future. Skinning causes problems with the consistancy of a UI and that's why you see Apple and Microsoft controlling how their OS can be skinned (Apple having only a "graphite" alternative and Microsoft only having a few ugly alternatives to that equally ugly blue thing they call Luna). I believe whatever the next incarnation of BeOS is should follow suit and offer a wide variety of carefully designed "themes" that keep the consistancy of the UI. Nothing more, nothing less.

What is your favorite Deskbar Replicant, and why?
I would be very shocked if anyone were to not say "ProcessController" when asked this question. Out of all the Deskbar replicants I use and know, I can safely say that ProcessController is the most useful, most informative and ranks the highest on the "cool factor". Where else can you launch a new terminal window, turn on and off processors, change a team's priorities, kill a team, quit an application, view cpu and memory usage, all from within an easily accessed context menu? That's right: nowhere. I love that little deskbar replicant. It's free, too (free being icing on top of the cake, and it's damn good cake!).

How useful are saved Tracker Queries?
Recently I've taken to reorganizing my music and I've added a "rating" attribute to my mp3 files in which I rate tracks from 1 to 5. If I only want to hear my favorite songs, I simply double-click my "View Favorite Songs" saved query and voilla, a Tracker window pops up with all the songs I've rated as 5. This is a feature iTunes has (and Windows Media 9 beta has) ... but Tracker can do this with no extra programming and has had the capability for years. A database-like filesystem allows for these sort of things and has really infinite possibilities.