Buy this on MOO.com
Moo.com Some unusual mini cards, postcards, notes, stickers, etc. at reasonable prices for small quantities. The standard designs are good, or you can customise them. I'm thinking of putting something together for a product launch in a couple of weeks.
Caroline Middlebrook has written a very comprehensive guide on using Twitter which is great for beginners and for business owners wanting to use this tool for marketing. Some useful pointers on 'Twitetiquette' - there's a whole new language awaiting you with Twitter! (If you want to 'follow me' I'm at www.twitter.com/LouiseBJ )
Emyr Williams of Bytestart is one of the stalwarts of small business information. The site contains literally hundreds of articles for start-ups and growing businesses alike. There's a newsletter too, that I've been getting for some years, as it provides updates on changes in company law and other regulations.
Say No to 0870 is an excellent resource (I've used it twice this week). If you're like me and don't like paying up to 10p per minute for calls to UK non-geographic numbers, go to this site. Type in the 0870 number and you'll find out if there is a geographic alternative number listed, that is cheaper to dial. You can also contribute by sharing any alternative numbers you know of. This site also covers 0845, 0844, 0871 - as well as 0800 and 0808 numbers that can be costly for mobile users.
I hope this is helpful.