Hi
I'm not sure if this should be reported in the bugs section: If you open a table in design mode in VS2008 and change the conflict handling algorithm of a unique (primary key) column to anything different than the standard "Abort", save and then reopen the design mode, it's reset to "Abort".
Even if the conflict algorithm was set programmatically before (e.g. "ID VARCHAR(31) NOT NULL PRIMARY KEY ON CONFLICT REPLACE"), the designer resets it when saving changes to the table.