I did; in my case, I ordered an absentee ballot and sent it in later in the day that I got it. The county I live in started it yesterday, at the libraries. I volunteer at one branch on Monday, and yesterday, they had about 5 polling stations set up in a meeting room - and had a line at one point! I heard on my local news that about 800 people have taken advantage of it so far.
I help restock the self-service bookstore in the room they have to walk through to get to those rooms, and people were buying books left and right. This is really great for us, because not only are they supporting the library, we have an awful lot of overstock in our back room.