We can hide the Group name in out of the box list view using JavaScript.
Grouped List View before adding JavaScript:
JavaScript (MOSS 2007/WSS 3.0):
<script type="text/javascript" language="javascript">
_spBodyOnLoadFunctionNames.push("HideHeaders");
function HideHeaders() {
var elements = getElementsByClassName(document, "td", "ms-gb");
var elem;
for (var i = 0; i < elements.length; i++) {
elem = elements[i];
elem.childNodes[3].style.display = "none";
elem.childNodes[4].nodeValue = elem.childNodes[4].nodeValue.replace(':', '');
}
elements = getElementsByClassName(document, "td", "ms-gb2");
for (var i = 0; i < elements.length; i++) {
elem = elements[i];
elem.childNodes[3].style.display = "none";
elem.childNodes[4].nodeValue = elem.childNodes[4].nodeValue.replace(':', '');
}
}
function getElementsByClassName(oElm, strTagName, strClassName) {
var arrElements = (strTagName == "*" && oElm.all) ? oElm.all : oElm.getElementsByTagName(strTagName);
var arrReturnElements = new Array();
strClassName = strClassName.replace(/\-/g, "\\-");
var oRegExp = new RegExp("(^|\\s)" + strClassName + "(\\s|$)");
var oElement;
for (var i = 0; i < arrElements.length; i++) {
oElement = arrElements[i];
if (oRegExp.test(oElement.className)) {
arrReturnElements.push(oElement);
}
}
return (arrReturnElements)
}
</script>
JavaScript (SharePoint 2010/SharePoint Foundation 2010):
<script type="text/javascript" language="javascript">
_spBodyOnLoadFunctionNames.push("HideHeaders");
function HideHeaders() {
var elements = getElementsByClassName(document, "td", "ms-gb");
var elem;
for (var i = 0; i < elements.length; i++) {
elem = elements[i];
elem.childNodes[0].childNodes[1].nodeValue = "";
elem.childNodes[1].nodeValue = elem.childNodes[1].nodeValue.replace(':', '');
}
elements = getElementsByClassName(document, "td", "ms-gb2");
for (var i = 0; i < elements.length; i++) {
elem = elements[i];
elem.childNodes[1].childNodes[1].nodeValue = ""; elem.childNodes[2].nodeValue = elem.childNodes[2].nodeValue.replace(':', '');
}
}
function getElementsByClassName(oElm, strTagName, strClassName) {
var arrElements = (strTagName == "*" && oElm.all) ? oElm.all : oElm.getElementsByTagName(strTagName);
var arrReturnElements = new Array();
strClassName = strClassName.replace(/\-/g, "\\-");
var oRegExp = new RegExp("(^|\\s)" + strClassName + "(\\s|$)");
var oElement;
for (var i = 0; i < arrElements.length; i++) {
oElement = arrElements[i];
if (oRegExp.test(oElement.className)) {
arrReturnElements.push(oElement);
}
}
return (arrReturnElements)
}
</script>
Grouped List View after adding JavaScript:
Enjoy!