The Lightroom "early adopter" discount ends on April 30. For customers in the US, that means the price jumps from $199 to $299 on May 1. The early adopter program in Canada and UK also ends today, with the UK price increasing from £125 to £175 (ex VAT).
Lightroom is available for both Mac and Windows, and is an outstanding photo manager that provides an easy workflow from upload to output. It's a bargin at $199, so if you've been thinking about making the move, go over to the Adobe Store before the offer ends.