A new version of the firmware for the Vi40 has appeared at the ONDA website
ONDA VI40 Firmware update
http://www.onda.cn/Mp3/ProductInfo.aspx?ProductId=179
4.03 v0.8
File size: 275M
Update: 2012-02-24
Description: (A) enhance the stability of the system.
(2) system integrated part of Google applications, such as: Google electronics market
Increase in system compatibility, support for updating the application software installation.
Note:
1, the firmware package containing upgrade instructions, please read carefully before flashing.
2, after the upgrade was successful, the entire boot process, not by hand or other objects touch capacitive screen (program auto-calibration touch screen), otherwise it will affect the touch effect.
3, the query version number, check the back of the fuselage SN code sections 9, 10;
This one supports Android market and adds a slew of other new applications too (although mostly Chinese - I may have to learn Mandarin

)
I have loaded this one (takes ages from the website so you have to be patient) and appears to work well so far.
I have access to the market and in the system info tab there is an Upgrade (for the Firmware) now present.
I must admit I have only had this tablet for a week so far (here in Australia) and it is my first run with Android but I am more than pleased with my purchase.
Anyone waiting for this one all I can say is that it is worth it.