Tip: Samsung Epix — Task (and Double-Task) Keys
Several keys along the bottom row of the Samsung Epix's keyboard have both an obvious function (indicated by an icon) for quick-access to some feature as well as a second function you get when you press and hold the key.
From left to right on the keypad, they are:
Caps/shift: press once to capitalize the next letter you type. Press and hold to enact CAPS LOCK.
MEdia Net: short press launches MEdia Net, long press activates Voice Command (if that feature is enabled)
Symbol/Space bar: short tap on text-entry gets you a space, long press brings up symbols you can insert. A nice perk is that in the Today screen, the symbol/space key brings up the phone.

Holding down the Fn key and one letter on the Samsung Epix gets you ready access to wireless, shopping, video and more.
Here's a primer: