Directionally looks great. Versioning will be tricky as you finish this up. Thanks! (one little nit while I was perusing too)
http://codereview.appspot.com/3734041/diff/117001/java/gadgets/src/main/java/org/apache/shindig/gadgets/uri/ConcatUriManager.java File java/gadgets/src/main/java/org/apache/shindig/gadgets/uri/ConcatUriManager.java (right): http://codereview.appspot.com/3734041/diff/117001/java/gadgets/src/main/java/org/apache/shindig/gadgets/uri/ConcatUriManager.java#newcode119 java/gadgets/src/main/java/org/apache/shindig/gadgets/uri/ConcatUriManager.java:119: this.uris = uris; nit: Collections.unmodifiableList(uris) http://codereview.appspot.com/3734041/
