I do not care what term people use. Personally, I use Legos for the plural, because I do not care about protecting the trademark, and it is easier to say. However, a lot of people on the internet will insist that the plural of Lego is Lego, and they can get really pissy about it. read more
On this page (#18), the writer says, rather authoritatively, that “LEGOs” (plural of LEGO) is wrong because “LEGO” is a company name (a proper noun). I disagree. read more