Hi Ilan, if you have a book you want to make some brief comments about then in the Reviews discussion category (which is where I've just moved this post).
However for books that sydneypoetry.com supplies for review we're expecting 300 to 500 words (see the Reviews page). This is a courtesy to the publishers who have provided these books free of charge, and is a length at which we'd hope to hear some ideas developed about the title reviewed.