Right now among the most recognizable names that accept Bitcoin as a payment method.
- Wuala by LaCie http://wuala.com/bitcoin
- Memory Dealers http://www.memorydealers.com
- VirWoX exchange http://www.virwox.com
The biggest name tied to Bitcoin is Google:
Google pays the salary for an engineer who works on BitcoinJ as part of his 20% time project.
And there has been a couple of well known individuals involved with Bitcoin:
- Randall Munroe creator of XKCD (mines bitcoin, trades on #bitcoin-otc)
- Jason Calacanis, This Week in Startups show has Bitcoin as a recurring topic
- Steve Gibson, Security Now show has Bitcoin as a recurring topic
Indirectly, bitcoins are already being used to make purchases at big names globally:
- Buy Amazon gift cards with bitcoins http://www.bitplank.com/products/amazon-com-gift-card-25
- Buy NewEgg gift cards with bitcoins http://www.btcbuy.info
- Buy VISA / Mastercard prepaid cards