So you have your appointment all scheduled and you want to know what you should bring with you.  Below is a pretty comprehensive list.  Of course, if you have some documents that you are unsure about - bring them too.

• W-2s
• 1099s
• 1098s (Mortgage interest)
• Copy of the last income tax return that was filed 
• Closing statement from real estate transactions 
• If you have sold any stocks, please bring the purchase information too (date and cmount Spent)
• Remember to keep track of any IRA contributions for the year (Roth, Traditional, Non-Deductible, and SEP)
• DMV Fees
• Charitable donations - cash, checks, Goodwill, etc.
• Charitable Donations - Goods to Organizations (Goodwill, Salvation Army, etc.)
• Property Taxes
• Tax preparation fees
• Totals for all of the work related expenses that are job specific (Auto, Dues, Postage, Printing, Publications, Telephone, Union Dues, etc.). 
• If you own your own business please be sure to bring all income and expenses
• If you have a rental property please be sure to bring all income and expenses separated by property
• If you pay for childcare please be sure to bring the name, address, tax identification number, telephone number, and the amount you paid for the year
• If you have paid for any college education for yourself or any children please be sure to bring the total amount paid for each person
• If you have a new dependent please be sure to bring their birthday and social security number
• If you have purchased a new vehicle please bring the contract for the purchase with you
• If you have paid estimated taxes please bring a complete list of what dates and amounts you paid to each government agency (IRS, State of California, etc.)