Using input 1.1, if I have two text boxes with the same name, I can access all the responses through a servlet with the ServletRequest.getParameterValues(String) method. However, <input:text /> (and the other input tags) only ever picks up the first element, even if there is more than one.
Support for multiple elements with the same name has been added to the subversion repository in revision 531148. There are two example pages (currently array.jsp and array2.jsp) showing how this works. The support is automatic and should work as you expect. I will be aiming for a release soon, please email me if you'd like a jar sooner.