I've been out of the hobby a bit, so I'm not altogether up to date, but from what I've seen, the advice seems pretty similar.
avoid bathroom stuff/mildew resistant stuff like the plague. generally, the old GE(?) silicone I (100%)clear door and window seems to be used pretty frequently. check the label, if it states it's okay to use on food surfaces, it's likely (but not always) to be safe for aquariums.
also, I've recently heard of people using gorillaglue. I think it's a polyurethane adhesive. might be worth looking into.