Here's a little thing I've been thinking about. I put it here because it involves making a new plugin and some big changes in some of the existing ones.
I'm about to develop two Swedish gateways for Marketpress. I think it would be awesome if Membership and Supporter could use them as well.
So the suggestion is develop a new plugin called i.e. "Payment Tollgate" or something other fitting.
That plugin would handle the connection to external gateways and have an extendable API for other plugins that need payment possibilities.
Then adapt Marketpress, Membership, Supporter and other relevant plugins to use it! Simple, right?
I realize it's a big one, but it would make it a lot easier for you to extend in the future and for us users to adapt local gateways to your entire stable of plugins What do you think?
Can I have some +1's?