Update: Shortly after I posted this, I booted back into my WinXP install, which then didn't see the wireless card either. Spent the last while on the phone with HP, as it's starting to look like a hardware problem. Flashed the BIOS and the wireless connection showed up (in Windows) for a minute, then when the HP tech had me try to update the driver as well, the device didn't come back up. Unfortunately, HP won't help me until I put the OS that it shipped with (Vista) back on the laptop, so I'm off to backup my data and reinstall that from the recovery cd's..just to get them to take a further look at it.
While part of me sees where they're coming from...the other part is getting a headache at the prospect of having to redo everything I've got working so far with Fedora. I guess the upside is that now that I've gotten things working great once, it shouldn't be as hard the second time.