I often have Halachic questions that upon approaching local Orthodox rabbonim, I don't feel comfortable with their psak. I know enough to know that they don't have a complete grasp of halacha but I don't know enough to deal with the questions on my own. I have no problem accepting the psak and moving on but I really wish I could approach someone approaching the level of Rav Moshe Feinstein who had everything at his fingertips. Are there any leading poskim (ones who have a complete mastery of all areas of halacha) who are easily accessible for the regular guy on the street?
Although there is no substitute for a personal Rav who understands one's own specific situation, if someone is in a difficult situation then I have found http://dinonline.org/ to be a strong group of talmidei chachamim and dayanim who can answer questions over email or the phone. Within just a couple days, they can relay your question to the gedolei haposkim in Eretz Yisrael for guidance too.
Rav Shlomo Miller shlita, a posek in Canada and one of the contemporary gedolei hador Web site: "frumtoronto" (send the questions to his assistant and he will get back to you in about a week or so)
There are other Web sites that answer questions, but Rav Miller is the only one I know of where you can get an answer from a gadol.
You can also go to various rabbis in person.