Wow! I expected one or two replies. Thank you so much for all the great suggestions. I had completely forgotten Criolla's had a bar. I've never been to Borago but it gets so much good press here I'll make it a point to try it soon.
Now, I must weigh in on the tangent. Being a solo dining veteran around here, I can attest that going in without a book is not advisable. I'm a chatty person and would definitely prefer to strike up a conversation with the bartender, sushi chef, or fellow diners...but the opportunity does not always present itself. I went to the Old Florida Fish House without a book recently, sat at the sushi bar, and because the sushi bar was so busy I waited 35 minutes for my food and the sushi chef was way to busy to make small talk. Uncomfortable in your skin is sitting in a crowded restaurant with a group of teenagers on one side and a support beam on the other, a busy staff, trying to read Bill O'Reilly's lips. Perhaps those lists are referring to people who try to read while they are actually eating. I never do that, because the whole point of eating in a good restaurant is to pay attention to the food.
Thanks for all the great ideas. If anyone else is interested -- I have found that Hurricane's Oyster Bar and Blue Buddha are both good places to go alone.