Real OSes on affordable hardware. In the early 1990s, Unix on commodity desktop computers was doable but only just, especially compared to now. The GNU Project was still trying to put together a whole OS as opposed to focusing on creating a set of solid and featureful userland utilities (its current role), the BSDs were under the cloud of the AT&T lawsuit (not fully lifted until 1994), and Linux was in alpha or early beta stage at best. Disks were small, networks were slow, and memory was fairly expensive.
On the other hand, Softlanding Linux System came about in mid-1992, Debian came around in the middle of 1993, and Slackware a month earlier. The first Linux kernel capable of running X was released in March 1992, but the first 1.0 release wouldn’t be until 1994. (Interestingly, Tux wasn’t adopted until 1996.)
On the other side of the divide, 386BSD was first released in March of 1992 and BSD/386 was available to buy from the BSDi company at that time as well. (In fact, BSDi’s phone number, 1-800-ITS-UNIX, was one of the things to spark the lawsuit: Unix was and remains trademarked, a mark now owned by The Open Group.) So the pickings were not nil, just very slim, and they were going to get much better in a few years.
The Internet was a lot smaller then, but Usenet was more usable. The Backbone Cabal (There Is No Cabal!) was dead by that time, the Great Renaming had been done, and finding a well-connected site to get a feed from wasn’t a major problem, but the Endless September was still a year away and spam hadn’t become a major problem yet.
Even more interesting was that a lot of also-rans were still running fairly hard back then, including the Gopher protocol and, to move away from the Internet, Fidonet was still fairly active in this country. (Yes, Fidonet does still exist here. Echos are still gated to Usenet. Pointers available on request.) The Web was in its early phase, though, and there wasn’t very much of interest on it. I would miss a lot of my favorite sites and cultures, including most webcomics.
Politically, people were sick and tired of being sick and tired. I could go through the 1990s again, especially compared to the last six years, but I’d miss the unofficial news spread by blogs. Usenet and other discussion boards never quite had anything to compare with that. As a side note, I’d anonymously mail copies of the 9/11 Commission Report to the Pentagon, the White House, the Washington Post, the New York Times, the London Times, and Osama bin Laden. I gotta have some fun with my Unholy Knowledge.