Just a small detail… but I noticed that instapaper updated their favicon. I like how they went with a chicklet style. Kudos! It looks much better. It’s interesting that they went with a 16x16px instead of their original size, 57x57px. I’m assuming they went with 16×16 because it’s a smaller file size, which means faster load time.
Old Instapaper favicon (57x57px 3.7 bytes)
New Instapaper favicon (16x16px 0.495 bytes)
They could probably go with a 32 color gif—I was able to squeeze it down to 0.273 bytes simply from photoshop. And there are more ways to slim it down further…