Dell accepting Bitcoin is bad sign for the short term price, simply with the adoption rate slowing down big purchases will exhaust and stress up the price, although if adoption will catch up then it is a good sign for the long term.
Suppose you want to maintain 80% bitcoin, 20% fiat in your portfolio. Then there are only three possible cases:
1) You're under 80% bitcoin. Why would you spend bitcoins now, unless you're going to immediately buy them back and then some to get back to 80%? Not bearish for the price.
2) You're at 80% bitcoin. You might spend, but to the extent you do you'll be more and more likely to buy them back. Not bearish.
3) You're over 80% bitcoin. You'd like to sell, but if you can easily spend since you wanted to buy some stuff anyway, you'll do that instead to the extent you can, until you're back to 80%. In other words, you would've sold those coins anyway and instead you're spending them. Not bearish.
Verdict: Not bearish. For deeper insight into this, see the discussion of average dishoarding rates and portfolio balancing here:
https://bitcointalk.org/index.php?topic=345065.0