I'm totally screwed aren't I? First infection and I'm kinda freaking out (inb4 RDWHAHB). Smell is slightly strange and taste seems okay. What should I do?
Yeah, tell us everything, including where you suspect your sanitation might have gone awry if you have a thought about it. If you think your sanitation was impeccable then maybe you're okay. But more info is needed to give us a chance to consider what you've got. So far, the pic is not so bad looking. To me, it kind of looks like the start of krausen build-up. Have the bubbles grown since your post? How long has it been in the fermentor? Did you notice any krausen yet?
Yes, that looks like the beginning of a pellicle. Give it a couple more weeks and you will have something that looks like this:
Keep in mind that taste is what it's all about! If it tastes good, you may want to save some of that for your next batch :0)
Hrmm.. Looks interesting. What style of beer was it.. You could have a tasty sour/wild ale on your hands.