The most important tool in you shopping cart is shipping rates calculator. The most popular shipping service providers are: UPS, USPS, FedEx, DHL etc. You can use only one or all of them. All these providers has online tools witch calculates how much will it cost to ship from your place to customers shipping address.
If you use open source shopping cart like osCommerce or any other. There are a big possibility that they already has integrated these tools. But if you have your own software, there is good tools for …

osCommerce is a free, open source online shop software. The default installation includes a large number of features that you can easily enable and configure. You can easily install osCommerce on your website with the help of the Fantastico auto-installer.
With osCommerce shopping cart you can add multiple products on your site, organize them in categories, set discounts and special promotions. osCommerce allows you to accept all popular payment methods: PayPal, credit cards, cheques. osCommerce has a built-in shipping and tax functionalities.
It also supports multiple currencies, allows customers to print invoices …

Keyword Research
Keyword Research is the first and probably most important job in process of search engine optimization.
Include keyword in Domain name.
This doesn’t mean having a domain name like keyword-keyword-keyword-keyword.com try to stick to the one hyphen and not read as spammy. A good example is a site that sells Dog Training Dallas with the URL of the site being www.DogTrainingDallas.com
Create as much content about your products or subject as you can.
Keyword in Title
If the main keywords are targeted in Title of the page, the chances for ranking higher in search …

Short for search engine optimization, is the process of increasing the amount of visitors to a Web site by ranking high in the search results of a search engine. The higher a Web site ranks in the results of a search, the greater the chance that that site will be visited by a user. It is common practice for Internet users to not click through pages and pages of search results, so where a site ranks in a search is essential for directing more traffic toward the site.