Who is your target market ? There are several types of businesses with varying sizes and in-house /vendor/homegrown solutions for Time management. You should pick one and focus your message at that. Otherwise your target customer will bounce off your page.

Also, you need integration with Payroll solutions (like ADP ). Call up your friends in HR and hit them up on how they do it now. I know from experience that payroll integration for vacation system is an absolute must.