The WRT54 is still one of my favorite pieces of industrial design. Small case, ~~purple~~blue and grey, two antennas.
Still have one, still works. Would happily use it if it were still practical. I think you can still load OpenWRT on them, but there's no software route around the hardware being outdated and slow.
My first WiFi router :)
I bought it in anticipation of the Nintendo DS having WiFi capabilities, which I had never heard of before (I was like 13 or 14 then). Had to convince my parents to get broadband internet too.