This control is really great!
I am planning to write a portfolio manager and thought about using bList for the list of shares. At first I thought I will get problems because I want to display additional information like the current value of the share in the list.
After sleeping a night about it I found the solution and I now present you the
completely customizable bListItem layout engine 
and it is really easy to do it.
The trick is to use a bitmap that has exactly the size of one bListItem. Then write a custom drawing function that just draws on this bitmap and then assign this bitmap to the bList item.
It is even possible to select an item. Just get the bitmap back from the bListItem and redraw it in selected state.
See the little example for details. (Needs ImageLibEx.dll and of course bList.dll)
The only limitation I can see on this is that you need a fullsize bitmap for every bListItem so you need some memory for very large lists.
I have two questions:
1. Will you provide the .cs file in the future so we can merge the dll into the executable?
2. Would it be possible to display something like a position indicator at the right of the list so the user can see if he can scroll up or down any more?