Perhaps removing tapir and uBrowser would be a good thing for D6, I'm talking more about workflow_ng (and subsequently the token module) -- its going to be a while before the rules engine is working properly, and when this module is released, its going to require major code changes. I however, don't believe we should be doing any dependency changes no matter how small, for 1.0. That should be done on the 2.0 branch. This brings up the question of, "do we want ubercart-1.0 for D6 released?" I'd say yes. Why? because this can be done within a month.

In the meanwhile, there is a large demand for D6 support, so my belief is to get the 5.x-1.0 release ported to D6 quickly, which should limit our issues to only API changes made in D6. This will make bug fixing a lot easier to tackle. Besides, I've already done all the grunt conversion work... now we just need to figure out the harder parts that need converting (forms api in particular).

I've already rebuilt tapir, and uBrowser in D6 and they appear to be working.
http://www.ubercart.org/forum/development/3995/tapir_15_drupal_6
http://www.ubercart.org/forum/development/3998/ubrowser_13_drupal_6

I'm currently working on workflow_ng, which I got 'converted' today, but it is not working. I'm soliciting help for this, but no one has come forward yet.

Once these modules all function, I think we'll see a quick conversion path to ubercart working on 6.x-1.0. Thanks for putting up the support.ubercart.org page, I signed up and I'll submit code, if I can as soon as I can.