There are some StackExchange pages, as well as blogs, which have LaTeX integration, e.g. http://mathematica.stackexchange.com/. On these pages one can simply write math LaTeX code using the $ delimiters. Is there any EMail editor/plug-in for Ubuntu which translates LaTeX input to pictures, or keeps it as LaTeX, and parses it in a nice way?

If not, is anybody aware of a tool, in which one can input LaTeX code, and the output is an image? Drag&Drop is appreciated.