http://blog.invisiblethings.org/speaking/
Please note that, over the last 10+ years, I've been regularly making significant amount of my work available for everybody for free (as in beer, and as in freedom). This is because I believe ideas and knowledge should be freely disseminated. But I think it's also fair for me to expect a speaking honorarium when I'm asked to put an additional effort required for travel and
My current speaking honorarium is 8,000 EUR, excluding travel and accommodation. I expect this honorarium to be wired at least 2 weeks in advance before the start of an event. Admittedly this amount is selected so that I could keep my conference traveling at a manageable level.
Please note that, unlike many popular conference speakers, I'm not trying to be especially entertaining for the audience, and generally prefer to talk about hard challenges or problems, or interesting technical matters, rather than performing an Amway-like show. Hire me at your own risk, in other words ;)
I'm a vegan. Please make sure that the hotel I would be staying at offers vegan breakfast. Also, in case you wanted me to attend any of the conference-organized dinners or other meals (including lunches), please also assure I would be able to get vegan meals. Please note that vegan food is more than just "salads", and that I'm unable to function eating lettuce only.
As a matter of principle, I don't travel to countries whose official laws are in stark contrast with my personal believes and values. This includes e.g. all the countries that discriminate against women's rights by law (such as most of the Arabic countries), de-legalize love (such as - incredible and sad to believe - Russia today), or otherwise limit people's freedom in some unacceptable way. To be clear: it is absolutely irrelevant whether I personally would be subject to any risk by such discriminatory laws or not.