I don't like the idea of shorting salesforce because the underlying business is a high quality business. I think that there are some shorts where your rate is return is going to be very poor. If a stock takes a long time to collapse, your rate of return is not as good. And if it goes up several times before then and you are forced to cover... :/
Some short ideas:
Einhorn has some detailed presentations on JOE and GMCR. (I am short both.)
At GMCR there may be some fraud going on.
JOE is a bet against Californian real estate. But it's more than that. If Joe has sold off all its best land first, then what's left isn't very good.
DDMG may be a good short because visual effects is not a great business. A lot of very good special effects houses (private businesses) go bankrupt from time to time (e.g. Orphanage, CORE, Asylum, etc.). Though this may mostly be specific to doing visual effects for movies. Commercials are ok but none of those companies are publicly listed (and they're really small).
(I am not short DDMG.)
IMAX is an ok short. Once they saturate their network then it's unclear how they are going to make profits. (They are maybe a third of the way there.) A fifth (probably less now) of their customers aren't paying on time... though I don't know if I am being overly optimistic because I am short Imax.
KBH is overvalued on a P/B basis and they aren't as well managed as TOL/LEN/NVR. I shorted this in the past, but I am not short it anymore. I think that most of their old losses should have been recognized for now; in the past after the housing crash, their communities weren't selling but they were capitalizing interest and not writing down their communities so book value was inflated.
High short interest like HOV.
GORO: http://thestreetsweeper.org/undersurveillance/Will_GORO_Ever_Find_That_Magic_Pot_of_Gold_
I am short this. The borrow is really ugly.
JCP: I am not short this... but probably will if it rallies. It looks like they have the worst managed stores in their retail space.
The free haircuts and upselling on the haircuts goes against their 'honest' pricing strategy. Read the comments on their Facebook page.
A lot of Ron Johnson's ideas should have been tested on a smaller scale before being rolled out. This is a huge, huge mistake. Even Sam Walton made mistakes as a retailer (read his book)... but the important thing is to not let mistakes hurt you a lot, to learn from mistakes and to constantly tinker.
The store remodels is another example of testing things on a small scale first. This is absolutely nuts.
It's just so weird that the Apple stores are one of the best retail operations around yet JC Penney is so awful.
Independent oil & gas: Apparently this sector is like airlines. I need to do more research here, but there may be names with negative free cash flow playing the inflated PUD (proven undeveloped) reserve game. I shorted ATPG in the past.
Junior mining: This sector is a huge destroyer of capital, even in a commodities bull market. Anybody have good ideas on shorting this? AAB and PNP (Pinetree) may trade at large premiums to book value one day... but they are trading at large discounts right now. G&A is a huge drain on both companies. Pinetree is a better short because it is diversified.
Maybe short GDXJ if/when it gets close to its all time highs?
I don't think it matters too much to salespeople if you pay them in cash or shares.
But CRM paying employees in shares is really smart as it is a phantom method of selling stock at high prices. And I don't think you want to short smart people.