I was developing against a web site project -- you know the ones in Visual Studio 2005/2008 where you can just point to a directory and do your thing (as compared to a web application project with an actual project file) -- and I noticed something a bit odd.  When I compiled the project the Error List was not showing file references, line numbers, columns, or any other information about the location of the compiler errors. 

I figured Visual Studio was just getting tired since it had been open for days, so I restarted the application in hopes that it would straighten out.  No such luck.  Then I restarted the computer.  That's what tech support normally recommends anyway, so I figured I'd start with the basics.  Once again, no error location information. 

At this point, I was starting to wonder if it was an issue with Visual Studio 2008 that nobody had noticed yet.  Of course, if VS 2008 wasn't showing error location information on web site projects then there probably would have been an outcry long before this.  So I hit the search engines. 

It was a pain to find, which is why I'm trying to help publicize the issue, but there are a few references to the exact issue I was having.  Specifically on the following sites:

http://www.developmentnow.com/g/51_2006_7_0_0_790825/Errors-in-Error-List-with-no-line-numbers.htm

http://www.dotnetmonster.com/Uwe/Forum.aspx/vs-net-ide/4006/Error-List-Missing-the-Code-File-Reference

What was the problem?  I was using parenthesis in the path to the web site project.  After removing the parenthesis, the problem was gone.