It's hard to say at this point how it will affect the company. To be honest, the company has been changing quite a bit over the past year or two as it is, well before it joined NASDAQ. Most of that boils down to its insane focus on the SSD market. It's understandable, but it's kind of sad at the same time... no more peripherals, cooling accessories... heck, I hope RAM is still safe!
Ryan, OCZ's CEO, loves his job and loves to come up with new and innovative products, though, and I'm sure that NASDAQ membership won't do much to wreck that. It's natural for a company to want to become larger, so I sure can't fault Ryan or OCZ for that. I'm excited just to see what's in store