Yes you read that right. In going back to make sure Stack v2.2 would work properly on 3.0, I had a horrid idea… A couple hours later, and I'd got it working. And man is it awesome! On a whim, I'd rewritten Stack to actually be an icon in SpringBoard. It can be moved anywhere, has all the same positioning and reordering abilities as any other icon, it doesn't interfere with other apps, and is generally the cleanest and best way I could ever implement Stacks (yes, with an 's', there can be more than one now!). It took an awful lot of hacking around and programming blind to pull it off, but I think it's gonna work really well. I have no idea when I'll release it, but it will (likely) only be for iPhone 3.0 and above (running out of 2.x devices here to test against for compatibility!). Also please note that I'm now taking donations as an incentive for me to continue working on Stack (as long as I can), so if you have anything spare to give I graciously accept any amount!
Here are various screenshots to just get you interested: