DNA chips, GeneChips, Lab-on-a-chip ...
Single nucleotide polymorphic (SNP) markers - Lander and Affymetrix Inc.
Nanoinstrumentation - fluid channels, pumps, electrophoresis, lasers, mixing, power supplies, heating, and lots of other exciting things on a somewhat small scale …
Monitor gene expression (up to 10,000genes per chip!) - measure a few transcrips per cell (“Parallel Gene Analysis”TMI Inc.)