According to their calculations, rafting is likely to open by approximately 15 June 2011. The river is an amazing 29.5 cm higher this year than the same time last year!
update (23 Feb 2011): according to a post on the Lonely Planet Thorn Tree rafting was ony stopped (Zimbabwe) for a couple of days in early Feb due to bad road conditions. But - water levels are now getting to high and rafting is expecting to close within the next week. Rafting at this water level is not great and is a very short trip.
update (18 Feb 2011): depending on the water levels, Zambian rafting camps will probably be rafting on the Zambezi between rapids 14-25 for another week or so.
update (11 Feb 2011): I just asked Richard from Chanters Lodge in Livingstone (btw - great spot!!!) if the Livingstone rafting companies are still rafting on the Zambezi and he confirmed it. They are currently rafting between rapids 14-25!
update (09 Feb 2011): I am just getting the info that come comps on the Zambian side of the Falls are still rafting. But with waves as high as 10 metres at some rapids i would not encourage it... thx Joy!