Krynski & Tenenbaum (2007) propose an intriguing Bayesian explanation for base rate neglect and the role of causality therein.
As for the conjunction fallacy, there are also several experiments by Daniel Osherson and associates supporting its reality (in the sense of it not being due to a misunderstanding of the question), which are available on Osherson's website.
Great reference, thanks!
The chapter on judgment under uncertainty in the (excellent) new Oxford Handbook of Cognitive Psychology has a handy little section on recent critiques of the "heuristics and biases" tradition. It also discusses problems with the somewhat-competing "fast and frugal heuristics" school of thought, but for now let me just quote the section on heuristics and biases (pp. 608-609):
My thanks to MIRI intern Stephen Barnes for transcribing this text.