Ultramarathon training plans for 100 miles, 100 Km, 50 miles and 50Km

Below are some selected ultramarathon training plans. I have not used any of these plans, but I have selected them on the basis of having a reasonable level of detail and some credibility.

Plan	Distance	Max Long Run	Back To Back	Peek Weekly	Length (weeks)	Days/week	Level of detail	Notes
Ultraladies 100 Mile Plan	100 Miles	30 miles	30+20 miles	75 miles	26	5	Detailed plan giving daily runs	No details on paces for training runs, just distance
100.doc Umstead 100 Mile Plan (Word Document)	100 Miles	35-40 miles	No	60-70 miles		5 + 1 day speed walking	Rough guide to each day of the week, but no weekly or daily details	Written for the Umstead 100, but some useful advice for other races.
eRunningGuide.com 100 Mile Plan	100 Mile	30 miles	25 + 30 miles	73 miles	24	3-4	Detailed plan giving daily runs.	No details on paces for training runs, just distance
Ultrarunning New Zealand 100Km Plan	100 Km	5 hours (45 Km/28 miles)	4 hours+5 hours		16	6	Detailed plan giving daily runs.	Specifies each run, with some indication pace, but no other advice.
Ultraladies 50 Mile Plan	50 Mile	28 miles	28 + 12 miles			5	Detailed plan giving daily runs.	No details on paces for training runs, just distance
Runner's World 50 Mile Plan	50 Mile	5 hours (27-29 miles)	4 hours + 5 hours		16	5	Detailed plan giving daily runs.	Some indication paces
Competitor Magazines First 50K Plan (pdf)	50 Km	26 miles	26 miles + 1 Hour		16	5-6	Detailed plan giving daily runs.	Specifies each run, with some indication pace, but no other advice.
Ultraladies 50K Plan	50 Km	26 miles	26 + 10 miles		20	5	Detailed plan giving daily runs.	No details on paces for training runs, just distance