An inexpensive Acrylic wine aerator … this particular design gets quite good reviews on most other sites (such as Amazon).
One advantage over some other aerator designs is that it allows for one-handed pouring, and so there is less likelihood of accidental spillage.
[Shipping cost varies: it cost me $3.95 to ship to hobart tasmania]
Do these actually do anything? Surely the wine is exposed to alot of air once in the glass.