I bought a factory-sealed bag of 100 red LEDs from Fairchild. Their forward voltage is almost exactly the same and they could be connected in parallel with a very small difference in current and brightness between them.
But I would not connect them directly in parallel because if I ever needed to replace one then it wouldn't match the forward voltage of the others.
Many LED arrays have the matched LEDs connected directly in parallel.
You're safer to raise the supply voltage and put them in parallel strings of LEDs, with each LED having its own resistor. You can use a calculator like **broken link removed** if you need help with the math.