Epson has a new scanner, the Perfection 3490, with all sorts of built-in doodads for scanning negatives: only $99 from Amazon.com.
But it's a USB 2.0 device. (Everything is a USB 2.0 device these days.) It will (probably) work with the USB 1.1 ports in nessus, but at one-eighth speed.
There are add-in cards that provide USB 2.0 ports, and even combo cards that have USB 2.0 ports and FireWire ports. One of those would be very useful in nessus. But buried in the fine print for these cards is the disturbing phrase: "Requires PCI 2.2".
Hm...what's in nessus? The manual doesn't say, the BIOS doesn't say, Windows XP has no idea. The motherboard in nessus is an ASUS P2B-D2; the Asus web site implies that PCI 2.2 is supported, but never actually says it does.
The P2B-D2 uses the Intel 440BX chipset; Intel has a nice Mature 450 and 440 Chipset Families page - Mature? Is nessus eligible for AARP membership? - that says the 440BX chipset is PCI 2.1 only.
No PCI 2.2 → no USB 2.0 → no new scanner for me.
Pity me, pity me.