This is a great module, that saved my sanity trying to figure out how to boost my site's load times with complex views.
What I would like to see it do as well, is give the opportunity to alter expire values for each block. After I enabled this module I did indeed get cached blocks, but they were only altered whenever I cleared the cache manually. I found no other way than to hack the block module, to add expire timestamp to all entries in the cache_block table. I think that adding the ability to set it for each block as you set which type of cache, would be excellent (not to mention would mean that I wouldn't need to hack the block.module :))