I'll reserve my opinions, and stick to the facts here. Everyone else, please pitch in!
Some keyboard shortcuts may not (and some simply will not) work until you've enabled the menu they appear on.
How-to:
Turn on Advanced Menu: Ctl-Alt-D < You will want these two menus on. They contain commonly
Turn on Developers Menu: Ctl-Alt-Q < used menu items, which are now ONLY accessible here.
Things that have moved to the Advanced Menu:
Search (Ctl-F)
Image Upload (Ctl-U) (Also available from the Inventory)
Stop Animating Me
Fly (Home)
Always Run (Ctl-R)
Mouselook (M)
Snapshot To Disk (ctl-`)
Reset Camera/View (Esc)
Build tools (now on Advanced as well as Build menus)
Zoom In/Default/Out (Ctl-0/Ctl-9/Ctl-8)
LL-approved keyboard shortcuts can be found here:
http://wiki.secondlife.com/wiki/Viewer_2_Quick_Start_Guide/Appendix_-_Keyboard_Shortcutsand the Quick Start Guide can be found here:
http://wiki.secondlife.com/wiki/Viewer_2_Quick_Start_Guide/Interface_overviewAnd finally, you can download the new viewer here (you will need to log into the website):
http://secondlife.com/beta-viewer/download.php?lang=en