Would you suggest some websites that contain online audio of lectures related to Judaism?
Here are some sites with online audio of lectures on Judaism. Most of these sites contain many free lectures.
I am sure that there are many other good sites out there. The readers of this blog are encouraged to "join the conversation" by listing other sites that they enjoy using.
You might also want to check out the "Audio Roundup" series on http://hirhurim.blogspot.com/. New online lectures are listed, linked to, and summarized. For an example, see here: http://hirhurim.blogspot.com/2010/06/audio-roundup-xcvii.html.