The Stirling Prize is nothing if not controversial. For the second time, a building which is not an riba-category winner has been included in the shortlist for the big prize: last time it was Sandy Wilson's British Library, this time Benson & Forsyth's Museum of Scotland. In both cases it would have been an absurdity not to include them; in the case of the latter, one architectural editor has described the building as 'the best built in Edinburgh since the First World War'. This does not, of course, mean that it is a guaranteed winner, any more than the British Library was (or rather wasn't). Some critics complain of too many ideas in one building. The competition this year is extremely tough; the obvious winner would have been the entire Jubilee Line station programme, but plans to submit it as a whole were scuppered by late completions, hence the nominations of the Wilkinson Eyre Stratford scheme, and Alsop Lyall & Stormer's North Greenwich. They have probably cancelled each other out. Given that one Stirling Prize has already gone to a German building (the Wilford music complex in Stuttgart), the chances of Foster's Reichstag may also have diminished. Astragal's tip: the Lords Media Centre by Future Systems. Tension will be high on the night, when David Steel announces the winner at the Kelvingrove Art Gallery. See you there.