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That's just great. My 1905fp monitor is perfectly fine, only a few years old but no driver for Vista. Shameful. I was planning on buying a new XPS 420 with Vista, but I refuse to buy a new monitor too. I have 3 Dell LCD monitors and apparently I won't be able to use any of them going forward. I will take my business elsewhere.
I am running Dual 1905FPs on a computer with Vista SP1. I'm not sure why you think you need drivers. The displays work fine and the usb hubs work fine. My Radeon graphics card correctly identifies the monitors by name as Dell 1905.
In general moitors have not required drivers - ever. The drivers usually just contained a mostly useless color profile. The graphics card itself is capable of querying the monitor as to what modes it is capable of displaying.
Could you tell us which Dell PC you are using with the 1905FP and also which Radeon video card?