UMP is the Unified Membership Plan most state LPs have signed with the national LP.

No UMP:
PA, MD, WI, ND, MT and NJ do not participate in UMP (I or II),
NH (and another state?) also recently decided to pull out of UMP.

UMP II: 
IN was the tenth state to sign up with UMP II, putting it into effect Jan '03. 
The other nine states for UMP II, triggering its commencemnt, are IL, IA, NV, 
AZ, TN, TX, NC, WA, and WV.

UMP I  -- UMP AS OF OCT 14, 2001:

http://archive.lp.org/lnc/pm/20011014.html

ARTICLE II. MEMBERSHIP

Section 7. UNIFIED MEMBERSHIP:
A. Affiliate parties which join the Unified Membership Plan
shall receive monthly payments in the amount of 1$ per member
or contributor having national dues-paying status, including
life members, or higher amounts according to the following schedule:
Members or contributors who have contributed $100 or more to the
national party in the last 12 months, $2/month; $250 or more,
$3/month; $500 or more, $4/month; $1000 or more, $5/month.

B. The Executive Committee shall establish transition policies
for affiliates joining this program, covering such matters as
phase-in of payments and treatment of existing state members.

 C. Affiliates leaving this program shall receive 12 phase-out
payments, starting with the amount they would have received for
the month that they leave and decreasing by 1/12 of that amount
each month.

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ALTERNATIVE UMP, PASSED MARCH 16, 2002:

The alternative UMP payment schedule would call for paying $0.50
per member per month for the first year, paying $1.50 per member
per month for subsequent years, retention of all but $13 by the 
state party if the state party recruits a new member, or in the case
of life memberships, the retention of all but $500.

http://archive.lp.org/lnc/lnc20020316.min.pdf

Monthly payments from LPHQ to states would be smaller in the 
first year of membership but larger starting in the second year 
of membership. So in year 2, the states will get $18 of the $25 
membership fee, "as long as the member keeps renewing."

Joining UMP II is optional.  States can remain in UMP I, or opt out 
completely if they desire.
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Information from Mark Nelson, LP Chair, IA and the minutes of the LNC.