Quick view - Ctrl-x + q Allows you to view file content in a separate window easily
Search for file - Ctrl + s Narrows down the file list to the individual file you're looking for
Compress file - F2 then 3 compresses the current subdirectory to tar.gz
Refresh file list - Ctrl + r
Show console/Hide panels - Ctrl + O Shows the underlying console window
Copy the highlighted file name to lower console line - Ctrl+j
Select a group of file - + Select a group of files based on a regexp
Frequently selected ftp sites (directory hotlist) - Ctrl + \
find files/find file content/find string in text file - Alt + ?
see directory size/how much space a directory occupies - Ctrl + space
change the size (width) of tabs, change left-right window width - Ctrl + Shift + left/right arrow
select all files and subfolders - Alt + Shift + '=' and enter '*' pattern
select the same directory on the second pane - Alt + 'i'