Google is pushing for devices to show an Android logo during boot-up, Chromecast works with more video and music services, and the FaceCrypt app uses selfies for security.
Lenovo has plenty of new all-in-ones for Windows 8, but none of them takes the opportunity to introduce a major new feature.
Desktop debut is notable not only for Lenovo's new hardware; those PCs also pack an unannounced Nvidia graphics chip.
If you're voting on Super Tuesday, you might want to check out our summary of the presidential candidates' positions on technology topics ranging from illegal wiretapping to Net neutrality.
The coolest phones at the Samsung booth are behind glass.