Ask HN: Good resource for circuit designs?

I am looking for some resources (books, web sites etc) where ideally there are some reference circuit designs with tradeoffs. For example, there are many different power circuits & techniques when powering the PCB and the components, I'd like to review the most common methods and understand the tradeoffs better. Is there anyplace that has that type of resource to learn from? Any open source designs that anyone can point me too that are good to learn from?

Essentially, I have considerable software development experience but have been spending more and more time on firmware only projects (which I am loving). In doing so though, I have run into quite a few patterns that I'd like to get better at identifying up front when evaluating the hardware (and while debugging) so I can be more efficient.