Zed Timesheet - Mobile Timesheet Application: Native for iPhone
Harvest - Simple time tracking, fast online invoicing, and powerful reporting software. Simplify employee timesheets and billing. Get started for free.
Expenzing - Expense management solution
Toggl - Toggl is an online time tracking tool. It features 1-click time tracking and helps you see where your time goes. Free and paid versions are available.
ClockIt - Get payroll done in 5 minutes.
RescueTime - Time management software that shows you how you spend your time & provides tools to help you be more productive.