The McCaslin platform is Intels' current solution for ultra mobile PCs (UMPCs). Intel competes on this market with VIA's C7-M chip.
The platform uses an Intel Stealy processor (officially known as A110 and A100) build using a 90 nm production process.
In Q1 2008, the McCaslin platform will be replaced with the more energy efficient 'Menlow' platform, which in turn will be replaced by 'Moorestown' in 2009.
Other sites with some info on the McCaslin Platform: