I would like to create a view that shows all nodes created by the currently logged in user OR where the currently logged in user has commented on.
D6 had a views_or module but it's not ported to 7.
Are there any simple solutions?
OR is built in Views 3 (see this issue) with a rather pleasant interface.
But for what you need, you can do this with a single filter: "Content: User posted or commented - Display nodes only if a user posted the node or commented on the node."
Views 3 AND/OR filter interface: