If that's all you wanted:
TinyXML is your best bet for a quick solution. It is a
DOM based parser, so it loads the entire file into memory upon parsing. The XML is basically turned into a tree which you can navigate. This means you really don't want to use if you have to process hundreds of megs of XML, but for many uses TinyXML is prefect.
EDIT: I am just a little floored, TinyXML is written by Lee Thomason, the "Programmer and technical lead for the Flash Player".