nerfherders anonymous was a site which keeped track of references to SW and other Lucasfilm projects, there's also a section about 'reverse references' or influences. the Indy films are listed at the bottom:

http://www.nerf-herders-anonymous.com/2001/07/reversereferences.html

Some are vague, others more specific. For example:

For Whom the Bell Tolls (1943) - (Dir: Sam Wood) Even their leather jackets were similar (though Indy's without the wool collar).

imdb.com has their 'Connection' page:

http://www.imdb.com/title/tt0082971/movieconnections

Which lists tv programs/movies which reference Indy, in this case.