I'm in the same boat that you are. We use .Net visual studio in the office, so they're likely to move to 2005 once it's available, but I saw no mention of ACT in any of the feature lists for any version of 2005 that I could find. I'll be reviewing the 2005 beta in a couple weeks, so I'll know more then. Personally, from what I've seen, the new test application is what ACT should have been to begin with (uses C (C#, or C++) instead of VB, still keeps things in code, but also has a navigateable GUI)...You won't be able to copy over old ACT scripts, but if the test code is as modify-able as it looks, you should be able to use the same sort of logic you did previously, at least. Some of the object/properties structure I saw in the code snippets seemed similar as well.
I prefer 'maliciously mischevious'.
TDAdmin of Evil