+ It doesn't seem to stamp on bits of the RMA now.
+ There is still a memory leak; Freenet doesn't return mbufs we use to the free-list. Eventually it will run out of mbufs altogether, which will render Freenet useless (and SLIPdriver will die with an address exception).
+ We can now fall back on small mbufs if there aren't any free big ones.
+ Asynchronous transmits are now implemented, though Freenet doesn't seem to use them. Multiple receive buffers are also implemented. These two may make things a little faster.