John Barr 's performance over the last year at the helm of the Needham Aggressive Growth Fund ( NEAGX ) is impressive. The small-cap-focused fund is up an eye-pooping 84% since last April, smashing the S&P 500's 30% returns and the 43% gain in the small-cap Russell 2000. Perhaps the most interesting part of those gains is that most of the stocks in Barr's fund, which Morningstar data shows has beaten 99% of similar funds over the last five years, are names not many people have heard of. And