There were some bizarre Tyranid-mechanicus hybrids on display, along with a rather cool Terrorgheist and Arachnarok Spider. However, the GW focus of the weekend was the Sci-Fi Weekender itself.
I had a table at the event, which happened to be positioned next door to the Black Library stand. This worked really well, because it meant that people who picked up a copy of Shadows Over Sylvania or Herald of Oblivion could then come and get it signed, without me having to leave my (very busy) stall.
On the Saturday, myself and fellow BL authors Gav Thorpe and Graham McNeill took part in a panel on Shared World fiction (with an emphasis on Warhammer and 40K, of course), which (I am told) was very enjoyable and chock full of useful advice to aspiring tie-in fiction writers.
I also noticed that I was signing quite a lot of Path to Victory gamebooks, which was nice.