Better highlighting when moving over a tab. It should be visually distinct when you mouse over the tab and when you are actively on a page that is within that tab.

Any indicator at all (change of background color, something) when selecting a sub-menu (like "Create Group" in the Contacts tab).

When you select a tab with no other information (like Preferences), the page should at least encourage the user to choose one of the sub-menu items. Even the "Welcome to vPanel!" should direct the user to choose from one of the tabs.

When you select the Features tab, you have a page with Basic Features to choose from. You can't get back to that page without clicking the Features tab. There should be a "Basic features" sub-menu item. Clicking the parent tab is not a good way to navigate.

Along the same lines, the Contacts tab should have a sub-menu item for "View Contacts", or at least something to make it clear where you are.

Make lists sorted in some fashion. I can't make sense of how anything is sorted on most pages. Viewing a contact's locations is not sorted by location or phone number, for example. Call routes, same thing.

Speaking of call routes, sometimes "*" is replaced with [0-9], and sometimes it isn't.

You can't pick a group for incoming call routes without choosing a different selection in the dropdown first.

Add help to most pages. I have no idea what "Blacklist" means in incoming call routes compared to "Disconnected" or "Busy signal".

Use more radio buttons and less dropdown boxes. On the Basic Features page, for example, I have to select the dropdown before I even know what my choices are.

Call history lists phone numbers, and replaces some with text ("Voicemail"). It should also replace known contact name/locations in there.

Change Call History to be more consistent with the other tabs. Instead of having a separate "All", "Incoming" and "Outgoing" in sub-tabs, make them sub-menu items directly beneath the Call History tab.

Please add "0" to the Duration field in Call History. It looks very strange to see durations of "7.5", then "0." or "7.". The last two should read "0.0" and "7.0". Right-aligning that number would also be nice.

"vPanel" and "VPanel" are used inconsistently. The titlebar and "Powered by" say "VPanel", but the welcome message and this thread refer to is as "vPanel".