This is excellent news:

We are delighted to announce that a reviewer discount now exits for all those who review manuscripts for Chemistry Central Journal, and this is linked to the rest of the the BMC series journals. The review must have been received on time, and during the last 12 months.
This means that if the submitting author has reviewed a manuscript for Chemistry Central Journal or any of the BMC series, they are entitled to a 20% discount off the article processing charge (APC) when submitting articles to any of these journals. We ask that qualifying authors request this discount at the time of submission.
The number of articles submitted to these journals continues to grow significantly, and we are grateful those who agree to review for our journals.

This is a terrific idea., and I hope BMC will extend a similar program across all of its own BMC series journals — that is, if you review for any of them, you qualify for some level of discount when you submit a paper to any other. (I’m an idiot. At least the link’s right.)
Recognition of the value of peer review is a Good Thing™ and long overdue; it gets plenty of lip service but this is the first time I’ve seen anyone put their money where their mouth is. Let’s just hope that funding and tenure review committees find a way to do something similar.
(Hat-tip: Peter Suber.)