Here’s a handful of links to useful pages.
- Lookup LaTeX symbols by drawing them! Lifesaver
- A growing collection of TeX/LaTeX examples. Currently mostly TikZ diagrams and drawings
- A Survey of Free Math Fonts for TEX and LATEX [PDF]
- An overview of math fonts for LaTeX (and TeX) with corresponding main text fonts
- Fonts with Beamer [PDF]
- Another overview of math fonts, focusing on Beamer presentations