While the default setting for Skype is to display all of your contacts in one list, you can divide them into groups. You'll need to turn on the group display by clicking 'Show Contact Groups,' under the 'Contacts' menu. Also under the 'Contacts' menu are tools for managing your contacts. Skype offers you the option to use preset groups, like people you've recently contacted or those that are currently online. You can also create your own groups, and add contacts just by dragging and dropping them on your contact list. How you divide your contacts comes down to how you work: one option, for instance, is to divide your contacts among the projects you rely on.