Unix admin here too. I also spent more time with Linux and FreeBSD during the dotcom era, but, strangely, for a lot of enterprise companies because I was working more on the security side of things. When I had to cast my net wider after the bubble burst, and after having moved to a new country, my lack of deep enterprise Solaris experience did bite me. Fortunately after a few years Red Hat was starting to do really well in the enterprise market and I ended up in banking, where I picked up a bit of Solaris again but I didn't really bother too much since the bank was actively getting rid of Solaris. I suspect many technologies used in the startup world now will get taken on in the enterprise after the bubble burst, but it will certainly take a few years and these companies will be weary of people who doesn't have enterprise experience.