If you find that Microsoft Windows Vista is slow to establish a dial-up network connection (DUN) ("register with the network"), that may be caused by it trying to also get an IPv6 on a IPv4 only ISP. Remove the IPv6 protocol from the Properties -> Network tab of the DUN then. Worked for me on dialing into an ISP via Bluetooth / mobile phone. Ymmv.
I guess many people know the issue of having a screen saver forced active after a some time through a group policy in a corporate environment. This is usually done to make sure systems are locked during breaks if people forget to press Win+L (or Ctrl+Alt+Del and then Enter). While that may well help IT security, it turns problematic when giving presentations for extended periods of time. Having to move the mouse through the presentation pointer every few minutes or dash back to the PC once the screen saver has kicked in, again, is simply annoying. On your company's systems you may be able to get the system admins to allow configuration of the interval or allow for disabling the screen saver, but on foreign systems you're often lost. But...
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