A list of software you should think about using:
(some titles cost money, and are indicated with $)

Website Authoring

Rapidweaver – like Dreamweaver, but much simpler, and for Mac only. $

WordPress – self-hosted website, in-browser editing.

Productivity

Apple iWork Suite (Pages, Numbers, and Keynote)

Apple iLife Suite (Garageband, iMovie, iPhoto, etc)

Microsoft Office Suite (depends on version – Word, PowerPoint, Excel, and Outlook)

Presentation

Keynote – presentation software for Mac, like PowerPoint, but prettier, and easier to use!

PowerPoint – industry standard, works on both Mac and PC, easy to use, available to most.

Prezi – giant workspace, zooming interface, great for brainstorm, story telling.

Google Docs Presentation – online presentation suite as part of Docs, easy to use, free, and available everywhere. Not as powerful.

File Storage

Dropbox – up to 2 Gb free online / cloud storage, pay for more. Use with multiple computers, accessible everywhere. Totally worth it.