US - Lono Entertainment (w/ Celebrity Video) have release "I Know How Many Runs..." on DVD in North America. It is also available on VOD.
UK/Eire/Australia/NZ - Anchor Bay have released the DVD, available in all good stored (UK - HMV, Aus - JB HiFi).
Germany - currently in final stages of negotiation for a German-speaking territories DVD release in early 2010.
South Africa - currently in negotiation.
Look out for more surprise festival screenings though! Was recently shown at the Bath Film Festival, UK - it's proving to be a popular festival film...