From online hypertext to pdf - some pay royalties, some pay flat fees, some simply provide publication in electronic format . . . and engage in a range of promotional efforts from just being online to placement with book retailers.
EbookoMatic
eBookstand [Subsidy Publisher]
Eastgate Systems, Inc.
Elusive Touch Publishing
Maxit Publishing
Internet Poets' Cooperative - Email manuscripts of original poetry in MS word format with bio and picture.