This short powerpoint presentation offered by the United Methodist Church explains the structure and rationale of the lectionary.
There are a number of excellent sites which offer preaching, worship and teaching resources linked to the Sunday Bible readings used in the RCL.
The excellent The Text this Week, contains a wealth of material. As well as contributions that are specifically written and original to the site, it acts as a gateway site leading into a wide range of other useful websites offering lectionary based resources.
The Anglican Church of Canada offers weekly Sermon aids linked to the RCL.
A collection of resources called Sermons that work - comments on the RCL texts on The Episcopal Church of the USA web are available.
The Oremus hymnal offers a considerable repertoire of hymns, with a particular focus on hymns used in the Anglican tradition. It also includes a database which links hymns to the RCL readings. As well as the many hymns which are uploaded onto the site with full words it also includes an index to all the hymns which have appeared in major Anglican hymnals (even if copyright restrictions do not permit the full tet to appear).
The Cyberhymnal offers a wide range of hymns. It also offers a considerable range of hymns either written in or translated into languages other than English.
The following sites offer a selection of resources for and articles about worship.
The Worship Well is a creative collaboration between Church Publishing Incorporated, the Office of Liturgy and Music of TheEpiscopal Church.. It offers resources linked to 'Word', 'Sound' , 'Image' as well as a selection of seasonal resources.
Lift Up Your Hearts, the Worship and Spirituality Site of the Evangelical Lutheran Church in Canada includes one of the widest and best organised wide selection of links to general practical liturgical and preaching resources.
A further section of the Lift Up Your Hearts site contains a collection of articles and resource links designed specifically with liturgical scholars in mind.
See also the Liturgy section of this Anglican Communion website.