Apple has its own MobileMe iDisk cloud storage service as part of its $99-per-user-per-year MobileMe service, which includes an email account and online calendar. The MobileMe iDisk app lets you exchange files directly with this service.

The Google Docs online software toolkit lets you work on text and spreadsheet documents on the Internet from your browser. Unfortunately, it is very difficult to use on an iPad. Although several apps let you open documents stored in and send documents to Google Docs, the $4 GoDocs app from LightRoom takes it a step further, allowing you to edit those documents directly from your iPad. (You can also edit them in Google Docs-compatible apps such as Quickoffice and Documents to Go.)

If you work with your own or clients' websites and need to send files to and from, Headlight Software's $10 FTP On the Go Pro will do the trick. It also lets you edit Web pages and related files, so you can update your site when on the go from your iPad.

Remote access

The free Citrix Receiver for iPad lets you run Office, SharePoint, and other data center apps on your iPad, through a virtual window to your Citrix-enabled servers. You of course need Citrix set up on the back end.