Track Standing...

Brompton easier for some reason though i still can't TS for toffee really.

There's a good tutorial by a US mtb chick online somewhere, i adapted the principals in it for a short skills coaching session i delivered once - got 3 of 8 TS'ing within 20mins. I'll look for the link when i'm on proper net again and can follow / post links more easily.

^that one I've seen too; recommends pedalling in slower and slower circles and feeling for the balance point when pedals near flat and stand as long as you can then roll around again. Rinse and repeat.