BIOS escape sequences over Serial Console April 1st, 2008
Note to self: works on Dell Poweredges using IPMI console redirection. So to attempt a PXE boot use the ESC-@ escape sequence when using the serial console.
Defined As
F1 F2
F3 F4
F5 F6
F7 F8
F9 F10
F11 F12
Keyboard Entry <ESC>1 <ESC>2
<ESC>3 <ESC>4 <ESC>5 <ESC>6 <ESC>7
<ESC>8 <ESC>9 <ESC>0 <ESC>!
<ESC>@
From IPMI on Debian
My favourite Dstat November 9th, 2007
Dag Wieers' Dstat is the ultimate live monitoring tool to catch your servers in the act.
My favourite Dstat command:
dstat -l -c -p -y -m -p -d -n
Which will paint this pretty picture on a wide-enough terminal:

Note the periodical repeating header at the bottom! Dstat is even smart enough to truncate the columns if your terminal can't handle the heat because it's to narrow - marvelous...
