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Virident - who won a big investment from Seagate - has PCIe SSDs in a variety of capacities. Usually less expensive than Fusion-io.
If you are running a storage area network - SAN - you might want a shared resource accessible over Fibre Channel. You'll pay enterprise prices, but the performance is stunning.
Violin Memory. Their unique architecture doesn't use SSDs. Instead they've designed a system that goes direct to the flash chips and offers excellent and reliably low latency.
Kaminario. Their SSD array is based on DRAM, not flash, for maximum performance. If microseconds count, you've probably already bought one.