There's free wi-fi on the main plaza (when it's working).
There are three ATMs in town (two on Caracoles and the other opposite the museum) but they do not always have money, so bring a big wad of cash, just in case. Many establishments take plastic, but some prefer the real stuff.
Oficina de Información Turística Helpful tourist office offering advice and doling out town maps and brochures. Check the annual book of comments for up-to-date traveler feedback on tour agencies, hostels, restaurants, transportation providers and more.