He's most famous for his writings, of course, but this year I thought it might be worthwhile to point out that he didn't just spend time writing, but was actually involved in some of the major practical and political controversies of his day. This is, incidentally, the reason why one of Anselm's iconographic symbols is the ship: it represents his work in trying to keep the Church independent of the state.
Since it's Sunday, it won't be used, but the Collect for his feast is a pretty good one:
O God, who led the Bishop Saint Anselm to seek out and teach the depths of your wisdom, grant, we pray, that our faith in you may so aid our understanding, that what we believe by your command may give delight to our hearts. Through our Lord Jesus Christ, your Son, who lives and reigns with you in the unity of the Holy Spirit, one God, for ever and ever.