The long version:

New in Netscape 7.01

* Popup Window Controls let you suppress pop-up ads when browsing. In Preferences, double-click the Privacy & Security category and choose Popup Window Controls.
* Home Page Group feature lets you automatically open several of your favorite pages as tabs when starting Netscape. After opening two or more pages, open the Edit menu and choose Preferences. Click "Use Current Group" in the Navigator preference panel.
* New AOL Mail features let you unsend mail, check message status, and keep messages marked as new.
* COPPA Compliance and improved security including greater control of certificates.

New since Netscape 6.2.2

* Netscape Navigator
o Tabbed Browsing feature lets to visit multiple web pages in a single window: Tabbed Browsing can be launched in one of three ways: from the File menu, choose New, then Navigator Tab; or you can right-mouse click on a hypertext link and open its contents in a new tab; or for those who prefer keystrokes, Ctrl+T opens a new tab.
o GroupMarks (Bookmark Groups) lets you bookmark several web pages in one bookmark: Open two or more Navigator tabs, then open the Bookmarks menu and choose Bookmark This Group of Tabs.
o Radio@Netscape lets you listen to music over the Internet: Click Radio in the Personal Toolbar.
o Click-to-Search lets you search for words you select in a web page: Select any word in a web page, right-click, and select "Web Search ..."
o My Sidebar Search Tooltips display information when you place the mouse over search results in My Sidebar Search.
o Download Manager lets you view and manage all your downloads: Open the Tools menu and select Download Manager.
o Web Site Icon (Favicon) support: Web Site Icons show up next to the URL in the Location bar, in bookmarks, and in Navigator tabs when using Tabbed Browsing.
o Save whole web pages: Save a whole web page along with graphics by choosing "Web Page, Complete" when saving web pages.
o Full Screen Mode gives more space to view web pages: Open the View menu and choose Full Screen, or press F11.
o Drag and drop bookmarks into folders, as well as improved bookmark management such as bookmark sorting.
o Print Preview lets you see a page before you print it: Open the File menu and choose Print Preview.
o Print Setup gives you greater control over how you print: Open the File menu and choose Page Setup.
o P3P (Privacy Preference Project) support give you more control over how web pages can use your personal information.
o Update Notification tells you when a updates to Netscape are available: Open Preferences and choose Advanced > Software Installation.
o Easier to open and close My Sidebar: Click the X in the top right corner of My Sidebar to close it. Click the Open/Close icon on the left side of the Personal Toolbar to open it up again.
o Set as Wallpaper: Right-click on any image in Navigator and choose Set As Wallpaper.
* Netscape Mail
o Mail Notification in Netscape Mail shows how many new emails you have.
o Quick Search in Netscape Mail and Address Book lets you more easily search your messages and contacts: Look for it at the top of your message and contact list.
o Mail labels allow you to prioritize your emails: Right-click on a message in your message list and choose Label.
o Create Filter from Message lets you add filters to Netscape Mail based on information in the message: Click on a message header in an email and choose "Create Filter from Message."
o Return receipts in Netscape Mail allow you to send and request confirmation that an email is received. To request a return receipt while writing an email, open the Option menu and check Return Receipt.
o Improved email importing in Netscape Mail: Netscape now supports importing email from Netscape Communicator, Eudora, Outlook, Outlook Express, and text files (LDIF, .tab, .csv, .txt). Open the Tools menu in Netscape Mail and choose Import.
o New corporate features in Netscape Mail including S/MIME, Shared folders for IMAP, Secure LDAP, and Offline LDAP.
* Address Book
o New support for exporting contacts: In Address Book, open the Tools menu and choose Export.
o Get Map: Click Get Map in a card with an address to automatically see a map using MapQuest.
* AOL Instant Messenger
o Buddy Icons: Choose your own icons that show up while chatting with your buddies.
o Buddy Alerts: Set up sound and window alerts when specific buddies come online.
o File Transfer: Send files to your buddy's PC.
o AIM Today: Keeps you informed about the AIM community, the latest news, and the newest Buddy Icons.
o Server-side Buddy List storage: Lets you access you Buddy List from any computer.
o New integrated ICQ: Chat with your ICQ friend using ICQ within Netscape.
o Sign On at Launch: Sign onto AOL Instant Messenger when you start your computer.
* Netscape Composer
o One-button publishing in Netscape Composer.
* Netscape Help and Support Center (Open the Help menu and choose Help and Support Center)
o New search feature lets you search for help topics. Click the Search tab in the Help window.
o Improved index and glossary: Click the Index or Glossary tab in the Help window.
o New information on Netscape keyboard shortcuts: Click Netscape Keyboard Shortcuts in the Contents tab.