You may provide info to the recommender but writing your own reco...

If your recommender is too busy, I see two options:

1) Asking someone else
2) Tell them that you have lined up someone else from the office to help out. And they can just sign/send that recommendation

I told my supervisor (who is around 3 levels above me) that she could delegate some of the work to a colleague who is a level above me. She never did but I think it's an okay option (as long as you confirm with the second person that it's okay).

well, if you write your own recommendation. at least you don't have to worry about your recommendation sucking.
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Diversity

B-schools strongly advise against it. Reading this guy's website (click link) made me wonder how common the practice is in reality, though.

While all of my recommenders (5, I split between schools) fit the "too busy" category, and I only interact with one regularly, they all got it in on time. I assembled a packet of info for each consisting of:

* Some of my app material for them (resume, 1 sample essay (HBS #1 'accomplishments' is a great one to use))
* Since my company has a 360* feedback system (and after checking with my management and HR on policy), I copied good feedback (and attributed it) from performance cycles. I edited that from 15 pages down to 6 and kept only the best quotes from people who'd worked with me. The idea was to give the recommenders a 'greatest hits' of feedback to see if any situations resonated with their impressions of me or sparked memories of similar behaviors. (Many of them were also quoted in there, so jogging the memory there was a bit easier!)
* I liked the Universal Recommendation Form so I included it, then for each recommend tried to jot notes about projects or interactions that I wanted them to remember.
* Finally, I included a cover letter/index and a summary of the strengths of each school I wanted a rec for and the reasons I wanted to go there.

I met with them each individually and asked formally for their help, and when they asked when it was due I gave them about a month before the actual deadline, as that was my target. (Given our company and our workloads, I knew that would be highly unlikely, so I padded a bit)

I did get some great feedback from my recs about the work I'd put into the packets. Taking it seriously shows them how serious you are about it, and the best way to help your recs present you - especially those that are incredibly busy and can barely remember that project from 3 months ago - is to jog their memory.

Anyhoo, good luck. It's an ethics thing, frankly, and I wouldn't do it, but apparently plenty of folks write their own.

According to Sandy on BW, who gets quite a few kids into H/S/W every year, some 60% of applicants write their own letters. This is something he mentioned on his thread. I highly doubt that he is more knowledgeable than the schools themselves. So, I guess schools are pretty familiar that most letters are written by applicants. However, don't expect them to say 'We know that most of you are going to write their own recs, so please don't worry, they do not matter that much anyway, except if they are tepid or utterly bad'. I actually think that most bosses are too busy to put together a good rec, and in addition, most of them are not good writers (with the exception of some industries such as IB and MC, where people are pretty familiar with b-school requirements). That is why I highly doubt that most bosses are able to write a letter that is concise, yet comprehensive, supporting each trait with an anecdote, while not being too generic. I read a sample letter in Montauk's book and it was outstanding, with polished language. However, I am ready to bet that most recs do not sound like that. After having some experience with essay writing, I can say that maybe after 5-10 revisions a rec would sound like that sample letter - polished, with no redundant words etc. But, who has the time for revisions? Of course, you could draft your recs for your boss. But bear in mind that some schoos explicitly discourage even drafting. Yale states that your recommender should not use anything drafted by you. But I do think that reality is slightly different from school websites and books.

I want to add on to this point. What if you have your boss write the recommendation in their mother tongue language then get it professionally translated?