Here as time goes on i'll add some console commands that are useful whilst playing instead of having to go right back to the menu. If there is a [] it means you must pick what to insert there, do not put the [] in.

name [yourname] - This command allows you to change your name.

listmaps - Lists the current servers map rotation.

listplayers - Lists the current players and their id number. Useful for kicking nuisance players.

timeleft - Gives the time left on the current map.

votemap [mapnumber] - Votes for a map.

vote [playernumber] - Votes to kick a player.

m_pitch [+/-]0.022 - Inverts the mouse if negative, returns to normal if positive.

drawradar - Turns the radar ON.

hideradar - Turns the radar OFF.

lefthand [1/0] - Toggles holding weapons in the left hand. [1 - on / 0 - off]

setinfo vgui_menus [1/0] - Toggles the Visual GUI menu. [1 - on / 0 - off]

retry - Retries loading the current server

disconnect - Disconnects you from the current server

quit - Quits you totally from CS