Practical attacks on WEP & WPA, including WPA packet injection:
Details (PDF): http://tinyurl.com/56j63s.
More here: http://tinyurl.com/8erk74.
From the site:
The attack is essentially a variant of the chopchop attack used against WEP secured networks, which surfaced in early 2005. The name “chopchop attack” is a nod to the KoreK-developed chopchop tool, which allows the user to decrypt an arbitrary [...]

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Here’s a good article on the subject.
Here’s also a good HowTo crack WPA.

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Wireless encryption stinks. It always has. Generally, the way I secure my wireless is first to engage MAC filtering (not at all secure, but at least filters out the newbies), then I engage an SSH tunnel to a trusted box @ home with the dynamic application-level port forwarding which allows the SSH server to act [...]

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