[pspencer]

It would be cool if you could search arXiv.org with this or maybe even subscription math/physics journal sites like JSTOR. Paid search results might be an opportunity for partial funding but I know that's not everyone's cup of tea.

[rhambasan]

We, at KWARC, developed a search engine capable of searching arXiv, see [1]. It can search latex-style formulae and CMML formulae.

In addition, one can also use "query variables", which means that if I search for, e.g., "?a + ?a" (?a is a query variable), I will get all sums of two equal terms. ?a could be an integral, a fancy function, or just a one-letter variable.

[1] http://arxivsearch.mathweb.org