It's the slow-loading, grainy pictures that really take me back.
and the marquee and frames based website :)
Be sure to scroll to the bottom, where there are a geocities affiliate button, the omni present (at the time) under construction gif, guestbook, netscape and ie 3 buttons, and green-led counter.
Back in the day I had the very same last three on my angelfire and then geocities websites... Ahhh, the memories.