Tim!  Do you support Bounty Projects!  :) 

I believe we still have an open discussion about File Based Image Segments
too, which is another funded bounty project.
http://weeklysqueak.wordpress.com/2006/12/19/storing-imagesegments-outside-t
he-image/ .

Here is recent conversation:
http://www.nabble.com/ImageSegments-as-persistence-t3254689.html 
 
Ron Teitelbaum

> -----Original Message-----
> From: squeak-dev-bounces at lists.squeakfoundation.org [mailto:squeak-dev-
> bounces at lists.squeakfoundation.org] On Behalf Of Avi Bryant
> Sent: Wednesday, February 21, 2007 1:58 PM
> To: The general-purpose Squeak developers list
> Subject: Re: sweep failed to find exact end of memory
> 
> On 2/21/07, tim Rowledge <tim at rowledge.org> wrote:
> 
> > It's an old issue; look up assorted reports of problems with > 2Gb
> > pointers. The VM code is mostly written under the assumption that
> > singed integers suffice for pointers and we really need to fix that.
> > It's an issue of available time.
> 
> Do you have an estimate, hopefully under 1 million euros, of what it
> would take to fix this?
> 
> Avi
>