127.0.0.1 - - [26/Nov/2006:22:56:37 GMT Standard Time] "GET
es HTTP/1.1" 200 886
http://localhost:3000/ -> /rails/info/properties
It seems to be constantly logging the actions of my web browser! Because
of this I cannot enter anymore commands into DOS without closing it and
reopening, which stops WEBrick! Any suggestions?
That thing is not DOS (which has been dead for >10 years). It is the Command Prompt, running CMD.EXE, a program that lets you enter commands as strings. (This is far superior to entering them with a mouse, because you can repeat and edit arbitrarily complex commands.)
Webrick does not do anything magical, such as start a service and then exit its command prompt program. You don't want it to. So it stays in this console and spews its output there. You need this to see, generally, what the server is doing.
To enter more commands, open another Command Prompt.