ISUB  I too have been using Overflow for a long time. When I heard Stacks announced over a year ago I was wondering if I would even need overflow anymore. I upgraded to Leopard on the 28th Oct (I got my pre-order early) and I still rely mainly on Overflow!

If you group like types of programs together, which I do, then Overflow is still your best option. Stacks still has an icon in the dock for each group of programs, the point of Overflow is to reduce clutter in your dock, so I can still have several groups of programs in Overflow without an icon for each group in the dock.

That's what Over flow is for, keeping your dock minimal, and it still does that better then anything else!  
(Version 2.5.5)

ISUB  Tell you what, this has been one of my fave apps for OS X. Stacks are helping me keep my desktop clear but I still collected the odd thing so this app is still great!

Has Leopard support now (still needs a few things tweaked though)  
(Version 1.3.1)

ISUB  Had emailed Zinio a few times too as the reader has never run very well on Intel compared to PPC. They replied and said they aren't working on updating Zinio Reader but they are working to make the magazines so they open in your web browser or something like that. Basically they are hoping to cover more systems that way.  
(Version 2.2.6496)

ISUB  Just bought this again (no free lifetime upgrades when I first purchased). Every time I have run the program tonight it disconnects after about 1min and it doesn't reconnect. I have attempted to run it 5 times now. I have also restarted and it still doesn't work  
(Version 2.0v201)