My last post made the same mistake that the original poster made. Basically, the tags either get stripped or are unescaped, so hopefully this works ...

The new entries are wrapped in "key" and "string" elements, respectively.

To clarify, *these* two lines should be added before both the closing and closing tags:

<key>SUFeedURL</key>
<string>http://www.objectpark.net/appcasts/MCC3.xml</string>

For example, the last six lines of my Info.plist file look like this (in case wrapping screws this up, each line begins with a tag):

<key>SUFeedURL</key>
<string>http://www.objectpark.net/appcasts/MCC3.xml</string>
<key>LSUIElement</key>
<string>1</string>
</dict>
</plist>