If you use IRC to collaborate on a software project, chances are you’ve come across
pastebin.com, a site where you can post snippets of code, program output, patches, and the like, and then give out the URL of the snippet to other people in the channel you’re working in. A similar site is
paste.lisp.org, which controls a network of bots that sit in IRC channels and announce newly pasted URLs for you. These seemingly trivial services make it
vastly easier to do collaborative development and debugging.
I just ran across a
mathbin.net, a site that takes one step closer to nerd heaven, by allowing you to write mathematical equations using LaTeX’s notation; it then renders the mathematics as inline images, using LaTeX’s renderer. The results are beautiful; here’s an example of the
Airy function defined over real values.

Of course, you need to speak some LaTeX to be able to generate such beautiful images:
\mathrm{Ai}(x) = \frac{1}{\pi} \int_0^\infty \cos\left(\frac{t^3}{3} + xt\right) , dt.
So mathbin is wonderful, but it’s not for everyone 🙂
Handy tip about pastebin; I was looking for something similar only last week to share DocBook-related files with a mailing list. I checked a few of those free hosting sites, but most either spam you, require registration, or use pop-up ads (some rather, um, dubious).
P.