My first foray into Bitcoin mining beyond CPU was an FPGA. The zTex was already outpaced by graphics cards and was overpriced but I ran it for a year. Wonder if an FPGA could be programmed to aid Bitcoin-QT reindexing.
Sounds like you were an early adopter. Cool. I mined with GPUs for a bit, couldn't buy an FPGA for trying and then got screwed over by BFL.
Anyway, I think the re-indexing is a single thread process. I've read into trying to speed it up before without a great deal of success. Increasing dbcache size in the conf file helped and using an SSD also helped but it still feels slow. I'm not sure a multi-FPGA configuration would help with that.