Founder, (sold to eBay). His First Round Capital has invested in StumbleUpon (to eBay), among others.

Cofounder of Motive. Portfolio includes Digg and Twitter.

Cofounder, Sun Microsystems; founder, Granite Systems (to Cisco) and Kealia (to Sun). Backed Google.

Early employee at Excite. Investor in MusicMatch and Ludicorp, maker of Flickr (both to Yahoo).

Founder and chairman, LinkedIn. Invested in Digg, Flickr, IronPort Systems (to Cisco), and Six Apart.

Cofounder, Netscape, Opsware (to HewlettPackard), and Ning. An investor in Digg, Plazes, and Twitter.

Early employee at Netscape. Early investor in Google and Shutterfly. As Sherpalo Ventures, backed Naukri and Plaxo.

Attorney, hedge-fund manager, and PayPal cofounder. As Founders Fund, invested in Facebook and IronPort.

Investor in some 500 startups -- in effect, a venture-capital index fund. Portfolio includes Facebook and Zappos.

PC-industry personality turned private investor in Brightmail (to Symantec), and Flickr (both to Yahoo).