Check out these stats comparing the 14th to the 13th Jan on hourly stats. check out between 5pm and 6pm.
3 different websites, 3 different sectors. same results. Data came back at midnight this morning. Click images for size.
***UPDATE***
Data returned around 430pm, thanks to Steve King (@sjkdesigns) for the heads up
Google Analytics Losing Data Again « - Shane Jones on January 19, 2010 at 3:23 pm
[...] Google Analytics Losing Data Again Its done it again as I reported on the 14th January [...]