Not much - although there are a couple of things I'm interested in.
There's the Wii Home Organiser, an official stand that can place your Wii, Remotes, Nunchuks and up to 6 games - you have to stop using your current stand to use it though so it may cause overheating due to lack of ventilation, and it's a tad big but it's still good - $20 in the USA - £9.99 in the UK. Google it.
Also, there's the Wii Fan Stand by Gamestop.com, for $20 online-only. It's a replacement stand that can cool down your Wii during Wiiconnect24 usage and it looks great lighting blue in the dark.