#183 Beautiful! It's simple and clever, I can see the S and f in the icon immediately.
I'm curious about a few things:
1) Glossy texture like #90 and your designer logo
2) Maybe a more adventurous font? I like how you've bolded the S and f to emphasize the correct pronunciation, but the "oggle" looks a bit ordinary
3) A hint of the "layers" theme - will be tricky to not ruin your simple design, but am interested to see what you can come up with.