Although ESL-SPIN is focussed on Australian resources, there are some interesting sites to look at, that cover migrant English resources elsewhere.

This blog article from the US features the Carringbush readers and comes from what looks like an interesting site: CollectEdNY: Resources for Educators preparing adult students for High School Equivalency and beyond.

Many of us have used the Bow Valley Readers, which as CollectEdNY point out, are no longer available. However, there are now some very similar readers from NATECLA in Scotland which may inspire someone here! (The NATECLA people are very friendly and receptive to queries.)