I also like shopinhk.com - but i wanted to register for a bunch of specific items that were not offered there, so i chose doublehappiness.com.hk
The way DH works is that they have several items online (like shopinhk) that you can just click on and register for easily. But their stock is quite limited.
They are also 'partners' with shops like Mothercare and B2B, and you have to go to those stores and use the DH registration form and fill out the sku number and description of those items that you want, then you fax the form to DH and they input those items to your online registry page. Then they arrange to have them picked up from the shops and delivered to your house when people purchase the items for you.
The process is a bit inconvenient, but it really will help out my family and friends overseas who want to buy me things, but do not want to deal with the shipping.
You can also choose 'customized' gifts - which are not from their online store, or from any of their partner stores, but they add 12% onto the cost of those items, and they don't actually purchase the items for you, they just wire the cash to your account when someone chooses to buy it for you - so really, it is better to just ask for cash in that case.