I have found this site helpful:

www.mindsolve.com/accountabilitydeficitdisorder.aspx

I'd add hr.com and the site for CLO magazine I think it's clomedia.com.

Thanks to the person who mentioned trainingzone I made a good contact.

I have found the following website helpful when it comes to tying the benefits of training to business objectives... it talks about key performance indicators.

www.businesslink.gov.uk

I have also found this website to be helpful:
www.apqc.org

I have taken classes with the Center for Effective Performance (Robert Mager) and they are excellent. http://www.cepworldwide.com/

If you Google performance +learning you will get 18 million hits.

I don't think Vignettes for Training is "performance" but they stress getting better results by doing things well. http://ela.vftraining.com/home/

The Big Dogs page was very useful to get the fundamentals right !!!
http://www.nwlink.com/~donclark/hrd/sat.html