I've noticed that there's a new ATMega8(L) datasheet, rev.X (let's count...). Okay, I said, they've marked it "Mature" or fixed some typo... let's see:
Changes from Rev.
2486W- 02/10 to Rev. 2486X- 06/10
1. Updated "DC Characteristics" on page 242 with new VOL maximum value (0.9V and 0.6V).
VOLmax is IMHO one of the cardinal design characteristics. And they've not noticed UNTIL NOW??? How long is it, 8 years???
I know ATMega8 is NRND, although the datasheet still does not say so. But this makes me question the credibility of ALL parameters in ALL AVR datasheets.