The name gives it away- this place specializes in dosas, which are thin, crispy pancakes rolled up and stuffed with a variety of fillings. A plate always comes with an assortment of sauces for dipping. I think Dosa Diner does a good job with their dosas. They come out piping hot, and depending on which pancake you choose, can be very spicy! I recommend the Rava Dosa with Masala Potato filling (spicy) or the Plain Dosa with Spinach filling (not spicy).
Dosa Diner also offers an Indian-Chinese menu (only on evenings and weekends). I tried the Vegetable Hakka Noodles, which I thought was just average- it tasted neither Indian nor Chinese. However, the other items on the menu, such as Paneer Manchurian, sound appealing enough to warrant another try!
One last thing to note for those of you who plan to visit- this restaurant is strictly vegetarian.