You can use the following temporary workaround in order to avoid the problem:
1. Attach OnGridCreated event handler:
    ...
    <ClientSettings>
         <ClientEvents OnGridCreated="onGridCreated" />
    </ClientSettings>
    ...

2. In the event handler configure the group header according to the number of visible columns in the grid:
          function onGridCreated(sender, args) {
              if ($telerik.isIE7) {
                  var visibleCount = sender.get_masterTableView()._getVisibleColumnsCount();
                  $telerik.$(".rgGroupHeader .rgGroupCol + td", sender.get_element()).attr("colspan", visibleCount);
              }
          }

It would be great if you could set a property on a column (like in WinForms) to hide that column from the column chooser.

e.g. <telerik:GridBoundColumn ShowInColumnChooser="false" />

Hi Team Telerik,

i found a bug in RadGrid. This one only appears in Chrome Webbrowser.
Columnresizing only works once per column in chrome. You can see it right the way in your demo-site. Go to the Resizing Demopart and resize one column. Now try to re-resize it. It wont work. 

Best wishes Philipp

For the time being the following workaround can be used:

CSS:

    <style>
        .RadGrid_Default .RadButton_Simple input {
            border: 0 none;
        }
    </style>

ASPX:

        <telerik:RadGrid ID="RadGrid1" runat="server">
            <MasterTableView>
                <Columns>
                    <telerik:GridTemplateColumn UniqueName="EditColumn" AllowFiltering="false">
                        <HeaderStyle Width="70px" />
                        <ItemTemplate>
                            <telerik:RadButton ID="rbEdit" runat="server" Text="Select" Skin="Simple"
                                AutoPostBack="false">
                            </telerik:RadButton>
                        </ItemTemplate>
                    </telerik:GridTemplateColumn>
                </Columns>
            </MasterTableView>
        </telerik:RadGrid>

where Simple is the name of the used Skin.

There are TypeScript definitions for enabling intellisense

The selector area of the dragging to select automatically goes all the way to the left; could that be changed so that the area shows up only from where the user clicked to where the cursor goes, like Windows Explorer? (see attached image)

Bind RadGrid client-side to a WCF Data Service, using a separate GetCount method. Then filter on column typing the value 12345 in the filter textbox. The result is that the value is not passed correctly to the web service.