using stdin/stdout for templates?

Is it possible to read the template from stdin and/or write the output to stdout rather than from a file? It would be nice to avoid managing extraneous temporary files.

Using stdin/stdout without the -once flag would be nonsensical.

the -dry flag almost works for standard output, but it adds an extra leading line.

P.S. Do you have another mechanism for these sorts of questions, such as a mailing list? This is the third time I've (ab)used the issue tracker for usage questions like this.