Here it is; feature complete and just some minor bugfixes from 1.0:
If you haven't tried it, it comes by default in Ubuntu 10.04 (Lucid), you can enable the PPA in Ubuntu 9.10 (Karmic) by going to System>Administration>Software Sources>Other Software>Add and adding ppa:robert-ancell/simple-scan then installing the simple-scan package.
Any other GNOME system should be able to build it from source.
From now to 1.0 I wont be adding any new features, just fixing bugs and polishing.
Post 1.0 the major features I'm most interested in are colour management, optical character recognition, integration with gscan/gnomescan, integration with photo management software and storing density information in saved files.
Please help if you can!