Here is the problem with "Hopefully"; it should mean "done in a hopeful way" but it is usually used to mean "it is to be hoped" or "I hope". This is because we have no such word as "hope-ably". So it is correct to say, "She winked at him hopefully", but not "Hopefully the rain will stop soon". However, the Language Experts who decide about these things have pretty much given up on this one; William Safire now accepts it as meaning "one hopes".