Keyboard Tricks

All Caps - double tap the Shift key, it will turn blue.  All letters you type after than will be in uppercase. Tap the Shift Key again to turn off 'all caps.'  (Enable Caps Lock must be on for this to work. Settings > General > Keyboard).
Quotes - tap and hold the ? key and quotation marks appear. Slide your finger onto the quotation marks and release.
Apostrophe - tap and hold the ! key and an apostrophe appears. Slide your finger onto the apostrophe and release.
Letters with Accents - press and hold the letter then slide to the choice that fits your need.
Layouts:
Split Keyboard - Tap and hold the Keyboard key (on the keyboard itself), slide to 'Split'. Un-split by holding the Keyboard key then slide to 'Dock and Merge.'
Undock Keyboard - Tap and hold the Keyboard key, slide to Undock.  The keyboard moves to the middle of the screen. Dock by holding the Keyboard key then slide to 'Dock.'