Microsoft's Skype division has posted for download the 3.8 update, which adds support for the retina display on the newest iPad.
The 3.8 release includes "optimized graphics for new iPad Retina display," according to a March 26 post on the "Skype Garage" blog. It is available for free from the Apple App Store.
Apple previously posted a list of 20 or so retina-display-optimized apps.
Microsoft is incorporating support for pixelly-dense retina-display-style screens in Windows 8. The Windows 8 team blogged about Microsoft's plans on this front last week. There's no official word as to which OEMs will offer these kinds of screens on their Windows 8 PCs and tablets when they launch starting later this year.
While on the topic of Skype, it looks like Microsoft will be sending Skype President Tony Bates to the AllThingsD lions this year. Bates is one of the speakers on the AllThingsD Conference 10, which is happening in late May.
(There's no word on the AllThingsD site if other Microsoft execs like CEO Steve Ballmer or Windows President Steven Sinofsky will b speaking there this year. In 2011, Microsoft opted to use AllThingsD to reveal more information about Windows 8.)