Microsoft plans to release a software update that modifies the default behavior of Internet Explorer for handling user information in HTTP and HTTPS URLs. The details are in Knowledge Base article 834489.
This is a big deal. It will completely block the majority (probably the overwhelming majority) of “phishing” attempts, where someone tries to get you to log on to a phony site and then give up your Ebay/PayPal/Citibank details.
It’s also noteworthy that this patch is being announced in advance of its release. Keep an eye out for it.