Topeak RaceRocket HP and HPX -- both convertible for Presta or Schrader. There's another version that's better suited to high volume, low pressure tires. Great ergonomics too. The HP is the smallest functional mini pump I'd consider. Fits a jersey or jeans pocket, or even my Serfas medium size Speed Bag with the expandable pouch open.

Blackburn Core Slim (Presta only). Similar length and stroke as the RaceRocket HPX. Ergonomics aren't as good, due to hard, sharp metal end caps. But it has a better valve core tool.