The new demoplayer is in this patch. No word if this is a test version or what, but type in viewdemo [demoname] and then press F2. To make F1 and F2 rebindable go to your Half-Life or CS retail directory, open the valve subdirectory, and then the cl_dlls subdir. Rename the GameUI.dll to something else, like GameUI.bak (so it's easy to remember). These keys will be used for Tracker and the Viewdemo command in future versions. If you have the hardware, and the eyeballs, 1600x1200 mode is finally in Half-Life.