This article is from the Amiga CD32 FAQ, by Stuart Tomlinson with numerous contributions by others.
A: In the UK (check your usual sources of foreign Amiga mags elsewhere)...
Amiga CD! (included with Amiga User International)... Monthly. Some sections of issue 3 are CDTV and A570 compatible. Issue 3 was the last issue. They're still waiting for the Commodore issue to sort itself out, so maybe it'll start up again now that it has.
Amiga CD32 magazine... Not regular. Issues 1 and 2 are available through Amiga Format's back issues page. Issue 3 was planned to be out on December 1st. It hasn't been seen yet.
Amiga Power CD32 version... Not regular. Issue 49 has a CD32 version with some demos, a load of PD games, and a load of reviews of the all time top 100 games. It sounds like there could be more CD32 versions some time soon(ish).
Amiga Shooper... One off. Has a CD on the front with a load of graphics, fonts, sound samples, music, etc... You really need a CD32x or SX-1 to do anything useful with this.
CD Gold... One off. A CD-ROM based magazine for CD32, CDTV, A570, and any CD Amiga. There was only one issue published, the pilot issue.
CD32 Gamer. Monthly. There are two versions - the normal one and one which costs 5UKP more and has a full game attached to the front of the mag.