After throwing your laptop, charger, and spare battery into your travel bag as you head out the door, suddenly you don’t feel so mobile anymore. One solution is to rely more on your iPhone for basic business tasks, such as grabbing data from your company’s computer systems, managing a Web site, and even viewing, editing, and storing Word and Excel files.

For road warriors, the iPhone isn’t just about games–it can be a powerful business tool. With Apple’s release of the iPhone 3GS, the handset gains better security and improved real-time e-mail delivery, both appealing features for business users and their companies’ IT departments.

Need to keep track of invoices, manage your eBay storefront, or log your mileage? “Yep, there’s an app for that!” After consulting with mobile business experts, we collected the best business apps that the iPhone has to offer.

Who knows–maybe on your next business trip you’ll be able to leave that hulking ultraportable laptop behind.

[Check out the top 10 essential business apps for iPhone]