Shipping major potential JV partners a physical product via FedEx is a great way to build trust and show them that you are serious.
A JVNotifyPro member named Gabriel Howes has developed an incredible book on JV's entitled "Ultimate Joint Venture GOLD." The book is targeted at offline joint ventures, but almost all of the information can be applied online. That's one way to look into it ...
Another way is by starting a topic and getting everyone's input on what they have done to attract major JV partners. I'll post some of my advice on this, but in all honesty, networking is the single best way to have successful JV's...
When you make personal contacts with other marketers before you present them with an offer they are far more likely to promote something than if you just present it out of the blue.
Meeting other people can be done by simply creating small talk, offering to help them out with something, etc. Do some research and get familiar with what they are doing and offer them something that they can use ... once you have done this, people will be far more likely to help you out.
Now if you don't have the time to make friends with someone first, then here are a few suggestions I have:
1. Make sure it's a killer product. If you have a killer product and are truly passionate about it your enthusiasm in your product will show in your proposal.
2. FedEx a physical product to these people. People don't throw out physical products because it makes them feel guilty. They will look at it -- but it's easy to delete an e-book (it doesn't cost anyone anything).
3. Send all of your marketing material with the physical product. Print out your sales copy from the site, send any promo emails you have, any testimonials, etc. If they can see that there isn't much work for them to do, but they will be offering a great product to their customers and making money, it's hard to say "no".
4. Tell them 'what's in it for them'. This is one of the top rules in writing sales copy to sell your product ... now why wouldn't you 'sell' to your JV partners. I see people overlook this far too often. Tell them exactly what they get, don't simply tell them how great your product is.
Those are a few quick guidelines to start off.
Let's get some more pointers to increase response from other JVers in here. What else are you doing to get the "big guys" to notice your products?