Solid-state equivalent of a battleswitch, might try one out in Drumroll for the weapon as it eliminates another point of failure (moving parts in a relay that could break):

http://www.ebay.co.uk/itm/SOLDERLESS-RC ... 862wt_1172

Also, some 8A (up to 30V) controllers that might be of use in the beetleweight class:

http://www.ebay.co.uk/itm/RC-BLIMP-Boat ... 493wt_1139

There are some 2A ones there that I'm going to try for my ant, will see how well they handle.
Picked up these links a few weeks back on the RW101 forum, just remembered about them now though and figured they'd be worth sharing.