Delegative Voting (HTML)
 Delegative democracy (PDF - draft)
 Wiki Democracy (HTML - draft)
 Delegative Democracy Revisited (HTML)
A Proposal for Direct Democracy Based on a Non-Binding Proxy System by James Green-Armytage: a proposal along similar lines to the "delegative democracy" draft above, particularly oriented more toward improving existing direct democracy practices.
Candidate Proxy Methods by Forest Simmons: A brief proposal similar to "delegative voting" above for single-seat elections, in which all candidates meet after the main, popular election and act as proxies in an "Election Completion Convention" to determine the final winner.
Liquid Democracy: Another very similar proposal. See also:
Two alternative voting system suggestions by Mike Ossipoff, one of which basically amounts to delegative voting or candidate proxy.
A Model for Electronic Democracy, a similar idea by Rob Lanphier.
Existing software that implements something like delegative democracy:
NetConferencePlus: collaboration software that includes support for "Delegated Voting"
VeniVidiVoti: an experimental Wiki-like engine based on voting with delegation.
Other interesting ideas:
Local Balance Representation: A scheme to encourages parties to form across ethnic boundaries and hence help to avoid civil wars in highly volatile regions.
Guarding the Instant Runoff movement by Donald Davison: An interesting and entertaining discussion of "Top Methods" versus "Bottom Methods", particularly Instant Runoff versus Approval Voting.
Useful electoral system sites: