One of the things that was always an issue (at least for me ;-) ) was to get a list of all sql servers available to the machine the code was run at.
Sure, there was the sqldmo,netserverenum and even a method using odbc, but each needed api calls (or interop). But for those of you interested: great news: whidbey has the requiring of the information build in !!!! :-)
The SqlDataSourceEnumerator gives back a datatable with information on the available servers. (See the link to find out precisely what information)
From .net 2.0 and up, filling a listbox with the server-names can be as simple as:
listBox1.DisplayMember = "ServerName";
listBox1.DataSource = System.Data.Sql.SqlDataSourceEnumerator.Instance.GetDataSources();