I forget what wireless chipset the Eee uses, but the initial drivers released for the Atheros chipset in the Acer Aspire One had some SERIOUS performance issues. These were fixed by a driver update.
Check for driver updates for all components in the Eee.
Just as an experiment, have you tried a wired connection for the VoIP?
At least as far as Hulu - the hardware is more than ready for prime time, the problem is that the "official" Hulu playback software is SEVERELY broken with 2-3 times the system requirements as the same video played back with any other player.
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*disclaimer* I am not now, nor have I ever been, an employee of Best Buy, Geek Squad, nor of any of their affiliate, parent, or subsidiary companies.