The practical value of a Flattr "point" seems to be right now around 0.15€, at least judging from the flattring I have done and that I have seen on my Flattr buttons. The exact value might of course differ, but as the current monthly money you can spend on Flattr is capped at 20€, things shouldn't be to far away for that estimate in general.
Summing up the numbers from Spreeblick.com confirms this, they had 679 flattrings and they say they collected 110,94€, which means 0.16€ per flattr, which comes pretty close to my own numbers.
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