Check out this list of the planned features and controls for our ASP.NET products in 2009. The ASP.NET team has put together an aggressive list of items and it looks to be an exciting year.
Along with the new controls like the mask editor, check combobox/listbox, rating control, there's also major features added. Two major features of ASP.NET 3.5 SP1 are Dynamic Data and the ASP.NET MVC framework and we're going to be supporting both. Stay tuned for more news on these features in the coming weeks. 
The team is also reviewing several of your suggestions which may be included in 2009. In fact, they've already reviewed and implemented several of them.
General
- ASP.NET MVC framework support
- Server installation
- Dynamic Data support
- Further optimization of ASP.NET controls rendering
ASPxGridView
- Mask editor
- ASPxListBox – Multi-select mode
- ASPxComboBox – Multi-column data presentation
- CheckComboBox
- CheckListBox
- ASPxGridView - Multi-header columns
- ASPxGridView - Keyboard support
- ASPxComboBox - Ability to filter or fill dropdown items (like Google search)
- HtmlEditor column
- ColorPickerEdit
- ASPxComboBox - Show the selected item's image within the edit area
- Horizontal scrolling
- Fixed Columns
ASPxHtmlEditor
- Table editing
- Visual selector for Image dialog /ImageManager/
- Dialog to insert document links to edit document
- Ability to change the editor's size using Drag&Drop
- Custom dialogs
ASPxperience
- SplitterControl
- Multi-line tabs for ASPxTabControl
- Validation Summary
- RatingControl — 5-star control
- CaptchaControl
As of this post, the list above covers the ASPxGridView, ASPxperience, and ASPxHtmlEditor Suites. However, keep an eye on our blogs for more information soon.