I've long been a fan of the excellent podcasts by Scott Kelby and Matt Kloskowski
and of Scotts accessible books..
I recently decided to sign up for on-line training through Kelby Training. It costs
around $24 per month and gives access to a huge number of videos covering a large range
of subjects... including Aperture, Lightroom, Photoshop and photography instruction.
Well worth checking out if you have recently invested in new software...