These sites are useful when it comes to hunting down information about items, and also when comparing prices and finding discounts:

http://www.computer-takeaway.co.uk - gives reviews of mobile and pda accessories and other electonic goods.  Also gives brief articles on selling and buying on ebay.

http://www.biology-protocols.info - although a resource for scientists it does have some articles on more obscure but useful small electronics.

http://www.happy-clicks.info - a general link site with useful links for resourcing information.

http://cashback.happy-clicks.info - a blog that describes how to save money online, also giving links to useful cashback and coupon sites.

http://www.first4dads.co.uk - a useful site for general and more detailed information on products for childcare and children.

If you want to recommend any others feel free to contact me.