In my experience, which admittedly is limited, most genericised trademarks aren't capitalised except in a few select cases (which I can't think of right now). I'm quite comfortable with using googled but if someone told me I was wrong and it really mattered I suppose it wouldn't hurt to use a capital, even if it does look a bit funny.
–verb simple past tense and past participle of "google".
Should this be capitalized? Genericized trademarks typically retain their capitalization, and by that rule we should write"I Googled it" instead of "I googled it". But, unlike most genericized trademarks, this one's a verb, and I just can't bring myself to capitalize a verb.