Something I would like to see is a site like the one (I forget the name at the moment) that let's you login in your web browser and mine right from the site, no software necessary. I *think* it only supports CPU soloing currently. Another example would be http://bitp.it
which let's you have visitors to your website mine in the background.
A major feature I would be interested in is combining this awesome browser based mining idea with the ability to choose what pool you are mining for. Perhaps the pool websites could incorporate a page that lets the users mine this way.
I have been trying to set up a PS3 for mining but am having a bit of trouble compiling and installing the necessary software on it. Yellow Dog Linux does not seem to play too nice with Bitcoin related software. So I'm thinking that mining in a web browser through Linux on PS3, but choosing the pool to mine for, might prove extremely useful.