16 GB MicroSDHC Card for $49

I believe all Palm OS devices use a 1-bit SD bus, so reading and especially writing data to a flash card is going to be pretty slow, regardless of the card's speed rating. So the inherent limitations of Palm's hardware is going to have performance falling way short of any SDHC card's speed ratings, IIRC.

Also, keep in mind that the Palm OS has major issues with volumes larger than 4GB, so that, a slow CPU & the usual NVFS quirks could be other culprits for poor performance.
Pilot 1000->Pilot 5000->PalmPilot Pro->IIIe->Vx->m505->T|T->T|T2->T|C->T|T3->T|T5->Zodiac 2->TX->Verizon Treo 700P->Verizon Treo 755p->?

Pop that card in a PC or a digicam and see how it performs relative to the Palm. In general, slow SD cards perform most slowly on Palm devices vs. other devices......and fast SD cards are still slower on Palm devices than on other types of hardware.

My usual test is recording video w/ audio to a card. If it can record XGA @ 15fps or VGA @ 30fps with no stutters or dropped frames, then it's fine in my book. Also, not all "Class X" cards are created equal. I have an el-cheapo Kingston Class 6 that's a good bit slower than a Sandisk Extreme III Class 6, for example.
Pilot 1000->Pilot 5000->PalmPilot Pro->IIIe->Vx->m505->T|T->T|T2->T|C->T|T3->T|T5->Zodiac 2->TX->Verizon Treo 700P->Verizon Treo 755p->?

I'm just hanging out for the day, they've got to have a few cards (pun not intended) up their sleeve. I'm just hoping they will come out with "well you guys said you wanted it, so here you go.", I know it's hopeless but there's still a glimmer. They are keeping such a (relatively) tight ship.