Update 7: STABILITY
Vista will be the most stable OS ever. Microsoft admitted that it had problems with stability with Windows ME and XP (without SP), but they really are making work of making Vista unbelievably stable. Microsoft even has made three special teams that researched Vista and future technologies for two years. After Vista is released, Microsoft doesn't even have to release any updates to make Vista stable, because Vista manages itself automatically and disables processes that can make your computer unstable and are unneeded by the applications you're running.

Update 8: SECURITY
Vista will have a better internet security. Instead of using very advanced ways to protect your computer, they're using somewhat primitive ways to keep users away from your harddisk. For example, Vista is able to completely halt every type of data transfer from your computer to any hardware component and is able to pause your internet connection when there is happening something suspicious. Microsoft is developing software together with Symantec (Norton Antivirus) to detect virusses the moment they reach your harddisk. Vista will be able to quarantine certain parts of the harddisk and make sure a virus gets automatically removed (using Norton Antivirus).

Update 10: MULTIPLE INTERNET CONNECTIONS
Vista supports a new technology that has been developed. With this technology you're able to use multiple internet connections (max 4) at the same time. For example: You have an DSL internet connection with a download speed of 100Kb/sec and a cable inter net connection of 80 Kb/sec. And you're downloading a file from a different user who has an upload speed of 140 Kb/sec. When you're using those two internet connections, the DSL connection starts to download 100KB/sec and the left 40 Kb/sec gets downloaded by the cable connection. This means you'll always be downloading at top speed, as long as you can afford multiple internet connections. Because of this you're able to play up to four different games at the same time online with just one internet connection.

Rembember: Microsoft said they are trying to get all of these features into the final version of Vista in 2006. They don't guarantee anything.