As of today, Adobe gives a 50% Discount on LR 3 until Feb.5 2012. For those who live in Germany, Amazon.de is selling LR3 for 125 Euro, which is even more than 50% off.
I 'll buy today and update to LR 4 when it comes out, hoping for an update Price around 100 €/$ (leaving enough headroom to make it a good purchase even if the update costs a little more)
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Christoph