[Josem]

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But do they work at all with poker programs? Does poker software use the same ports (port 80) as for http browsing?

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Not nessecarily:

"Dear Michael,

Thank you for contacting PartyPoker.com

The ports PartyPoker uses are 2147 & 443.

I hope this is of use to you. If the problem persists please write back
with more detail and we will be able to investigate further and assist
you."

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If my flatmates are downloading large files or streaming video, does that go over the ftp port (21), and so could I configure it so that these only take up a certain maximum amount of bandwidth?

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Yes... the link I posted above shows how to do this.

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And, uh, do I need to worry about all this or would it just work fine out of the box?

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It'd take a bit of fiddling, but it is possible.