I have stumbled upon a wargming support site which has come up with a great little idea for keeping track of a game in progress.
I like to call them "little reminders" or "brain joggers", this site calls them tokens or chits and you place them on the wargame board (usually next to units) as a reminder that there is some longer lasting effect that is in play (and does not disappear when the turn finishes). Also, I guess there are certain effects that can begin when a turn starts and need to be remembered during the turn in later phases (especially magic which affects the combat phase).
Anyway, you get to choose the colours and a variety of shapes and can add wording of up to 12 characters in length. The "chits" are about 20mm square (which is perfect for Warhammer in my opinion)
Gaming tokens to remind you what's going on in your Warhammer Battle ! (paste the below, as a single line, into your address bar)
litkoaero.com/Merchant2/merchant.mvc?Screen=CTGY&Store_Code=LAI&Category_Code=CTOK