Obligatory reference to http://thistothat.com/. It doesn't cover every factor, but if you just want to quickly find an adhesive that will do a good job holding one thing to another, it's great. It also gives decent toxicity warnings.
That is a cool site. But it is really lacking in regards to plastic (and they do seem to acknowledge that). I would love to see an expansion of the site to include various different types of plastic.
