I see lego is no longer allowed. Since this site seems to be not exclusively about LEGO, is this a good idea?
I think we should keep the LEGO tag - if we rename the site to make it obvious that we welcome k-nex, etc. then it makes sense to be able to say "I'm interested/not interested in lego"
Otherwise there's no way to filter them out later.
Edit to add - mostly responding to Dori's comments to her answer:
I've got no experience with knex, which (I feel) we should welcome on this site, but I'm not going to be able to answer any of the questions about that, so would like to be able to filter them out using the "Ignored Tags" feature.
The opposite is probably equally likely: There may well be people who are experts in knex, but with limited interest in LEGO - shouldn't they also be allowed to "Ignore" LEGO specific questions?
Finally, thinking far into a possible future - look at Facebook.stackoverflow.com if this site gets big enough that we become an "official" support channel for one of these toys, then providing this sort of separation is much harder if a specific toy isn't tagged correctly (we should aim high after all ;))