One of the hot topics at the moment is the exhaustion of ip4 space.
While this may not sound very exciting to "normal" people the impact it could have on you might be quite painful. If ISPs have to pay a heavy premium for more IP space as their networks expand, then the end users may be forced to pay a premium.
Jay Daley, Nominet's CTO, has an interesting post on the Nominet blog about the possible creation of a market in IPv4 space. It's an interesting read and it will be interesting to see how things pan out in the coming 12 - 36 months.
Of course if more ISPs were to start actively using ipv6 then none of this would really matter... I wouldn't hold my breath though, as so much consumer equipment in active use at present isn't compatible