But they are usually based on a miniature PCB with discrete components and are quite expensive.
The integrated 3pin regs are fairly similar and big improvements will be hard to find straight from the IC manufacturers.
For a soundcard you are going to be working with surface mount components -- Linear introduced the LM3080 a few months ago -- this is a low noise, low dropout regulator which uses a single resistor and should certainly beat the LM7809 in the relevant terms. It is available in MSOP, SO223 and TO220, no such equivalent for the negative rail, however. They are available in samples from Linear, or from DK for ~ $2.50.
Check Linear's product tables -- I have been very pleased with their low noise regulators, but the best seem to be surface mount, like the LT1761, LT1964
And Sangram's citation of the Wenzel Associates article is a must read -- this knocks the noise down to the nanovolts.