The Alaska State Archives has a couple helpful free genealogy resources for those with Alaskan ancestors in their family tree. The archives hold naturalization records 1880-1972, pioneer home residents 1913-1980, probate index 1883-1960, teacher records 1917-1959, World War I veterans 1913-1923 and vital statistics 1816-1998. Only two of these resources are available online at this time. You can submit a research request to the archives for lookups in the other collections. There may be a fee for this service.
The Naturalization Records Index offers quite a bit of information, more than you normally expect to find with an index. It gives you the name, alias, country, type, location, date, record type, precinct, case number, residence and occupation. It is a large PDF file so will take a few minutes to fully download. It is organized alphabetically by surname.
The Probate Index is also organized alphabetically by surname. It gives you the name of the individual, case number (when available), precinct, case type, date and information where the actual file is located.