Intriguing. I always pictured being a DNS server would require industrial grade infrastructure. Do you run a DNS server?
HEY! Maybe my Namecoin will be worth something someday.
One of my secondary DNS servers for >100 zones + backup resolver for ~80 nodes, doing 2 queries/s over 24h avg runs on an embedded 486-class embedded system with no complaints since years.
For home or SoHo, an old embedded system that can run Linux w/ at least 64MB RAM will do just fine.