There is no escape...believe it or not. Mathematics is everywhere.
I used Wallwisher recently with my Year 6/7 Maths class for some feedback about what they needed more help with, what they enjoyed and to find out how maths sessions could be improved. Have a look here: http://www.wallwisher.com/wall/hawkesmaths
I mentioned Wallwisher in answer to Lori's question on Web 2.0 so it seems worth reposting that here - see this link to my recent blog post on Wallwisher
My students enjoy Wallwisher and we now have a Maths wall for each topic that we study - it becomes home to key facts and examples for each topic we study.
Also - here is what they think of Wallwisher!
I see from my blog that someone must have arrived there via this discussion!
The latest version of Wallwisher is excellent - much faster.