another trick is to tack solder a thin piece of wire tween the two sides and then heat up the wire melting both sides @ once

I have not tried it yet, and in theory it seems like it would not be well suited to smd electrolytic (can type) caps

then theres the ole cut the can off, which frankly scares me since you need to put immense pressure on the thing your trying to gently remove

I am planning out an article on methods, when I get it posted ill be sure to let everyone know