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I moved away and am now planning to communicate with a friend over the internet and talk about mathematical subjects (e.g. via Skype). However the text blocks like "\int_G\omega..." in a chat window become more or less unreadable. It would be helpful to have a script like here on StackExchange, which translates the formulas.

Is there a good web page where one can write TeX code such that the other person sees changes live, or at least after pressing F5?

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    There is [GmailTeX](http://alexeev.org/gmailtex.html), and an associated "plug-in" for Gmail Chat. I've only ever used the plain GmailTeX, but it seems to work pretty well.2012-07-30
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    Or consider chat with screen sharing; I don't know if.Skype has it but Google+ hangout does. This can be used either in combination with TeX processing software on your end, or (with a stylus and touch screen) to hand-write the formulas.2012-07-30
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    This question (and also some links mentioned in the comments there) might be interesting for you: [Chatting about mathematics (with real-time LaTeX rendering)](http://math.stackexchange.com/questions/81365/chatting-about-mathematics-with-real-time-latex-rendering/).2012-07-31
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    You might also find something useful at TeX.SE, see e.g. [Simultaneous collaborative editing of a LaTeX file](http://tex.stackexchange.com/questions/27549/simultaneous-collaborative-editing-of-a-latex-file) and [Compiling documents online](http://tex.stackexchange.com/questions/3/compiling-documents-online).2012-07-31

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