Extending

Shift + Arrow Keys	Extends the selection by one cell in that direction.
Shift + Home	Extends the selection to the first column.
Shift + Page Up	Extends the selection up one screen.
Shift + Page Down	Extends the selection down one screen.
Ctrl + Shift + Up Arrow	Extends the selection to the next non blank cell above in the same column.
Ctrl + Shift + Down Arrow	Extends the selection to the next non blank cell below in the same column.
Ctrl + Shift + Left Arrow	Extends the selection to the next non blank cell on the left.
Ctrl + Shift + Right Arrow	Extends the selection to the next non blank cell on the right.
Ctrl + Shift + End	Extends the selection to the Last Used Cell on the worksheet. This will not work when the following option is ticked (Advanced, Lotus compatibility - transition navigation keys).
Ctrl + Shift + Home	Extends the selection to the beginning of the worksheet. This will not work when the following option is ticked (Advanced, Lotus compatibility - transition navigation keys). Does not work on all keyboards though.
End, Shift + Arrow Keys	Extends the selection to the next non-blank cell in that direction.
Alt + Shift + Page Up	Extends the selection left one screen.
Alt + Shift + Page Down	Extends the selection right one screen.

Shift + Arrow Keys Extends the selection by one cell in that direction.
Shift + Home Extends the selection to the first column.
Shift + Page Up Extends the selection up one screen.
Shift + Page Down Extends the selection down one screen.
Ctrl + Shift + Up Arrow Extends the selection to the next non blank cell above in the same column.
Ctrl + Shift + Down Arrow Extends the selection to the next non blank cell below in the same column.
Ctrl + Shift + Left Arrow Extends the selection to the next non blank cell on the left.
Ctrl + Shift + Right Arrow Extends the selection to the next non blank cell on the right.
Ctrl + Shift + End Extends the selection to the Last Used Cell on the worksheet. This will not work when the following option is ticked (Advanced, Lotus compatibility - transition navigation keys).
Ctrl + Shift + Home Extends the selection to the beginning of the worksheet. This will not work when the following option is ticked (Advanced, Lotus compatibility - transition navigation keys). Does not work on all keyboards though.
End, Shift + Arrow Keys Extends the selection to the next non-blank cell in that direction.
Alt + Shift + Page Up Extends the selection left one screen.
Alt + Shift + Page Down Extends the selection right one screen.