It is only a record if the sale has been adjudicated by a third party. To date, even the value of the sale has not been quantified publicly, as far as I can assertain.
I find it entirely credible that this sale might have happened, but I am afraid until it is confirmed, it must be treated with suspicion.
As for IDN, they will assume their market value over time, and from a speculation point of view time is short, as good models for calculating potential worth are already available. For many of the these domains Overture Searches and Bids can be evaluated. For this potential traffic revenues can be estimated. It is unlikely that these models will be very far out. IE 7.0 general release must be imminent. I would guess 4 to 6 weeks. Once the traffic starts to pour in, few with good names will have a good reason to sell much below the anticipated value of those domains. I think prices are going to scale a cliff in the near future.
Rubber Duck