Personally I use a Sony Vaio Laptop with the largest LCD screen I could find which I do the majority of my trading from. I regularly get a lot if funny looks and comments when it goes through the security scanners due to it's size

An iPad with 3G connectivity and unrestricted global roaming (using the pocket cloud app) to access my BA VPS.
An HD lead for connecting to my hotel room flatscreens. Often used to extend my laptop screens.
I have a Slingbox at home connected to the Sky box along with a Racing UK online account.
An unrestricted mobile phone and also a Skype account with Betfair's numbers already preloaded incase of Mobile Signal outage.
I'm interested to see what others use, if they carry other monitors, what ways they find best to view the live coverage... Was thinking I could be missing a trick....