Between Two Worlds provides an excellent round-up of the recent blogosphere debate on issues pertaining to the timing of baptism, church membership, and who should be allowed to take communion. A couple terms for any who may be unfamiliar:
credobaptism: the view that one should be baptized after he/she professes faith in Christ. Among adherents to this view, people disagree on the age at which children should be baptized. Those most conservative want to wait until the professing believer is at least 16-18 (so that their Spirit-empowered obedience to Christ can be distinguished from their natural (common grace) obedience to their (presumably) godly parents.
paedobaptism: the view that the children of believers should be baptized (see Ligon Duncan’s succinct argument)
open membership: the view that one’s position on credobaptism/paedobaptism should not impact whether one should be admitted into church membership
open communion: the view that one’s position on credobaptism/paedobaptism should not impact whether one should be allowed to partake of the Lord’s supper.