If you decide to buy a Mac keyboard, you can probably use it full time -- I used to use my Mac keyboard with my PC when I needed one. You just need to remember how the keys map. (Command becomes the Start key, as I recall, and I think alt and control swap places.)
For writing, I love Scrivener. There's now a PC version, but it's about two years behind the Mac version, and the new 2.0 for Mac is very shiny. Cost: $45 and worth every penny.
VoodooPad is hard to describe, but it's a text editor that lets you make your own hyperlinked documents, so instead of a bunch of individual documents, you have one big cluster. Think of it like your own personal wiki. I use it to keep notes for future projects, random story ideas, books I want to read, etc. Cost: free.
VLC is a media player that just works. If you've ever had to fiddle around with codecs on your PC, trying to get a weird media file to play in WMP, you will
love VLC. Cost: free.
Quicksilver is a programme launcher. Hit your designated hot keys (I use command + space), type the first letter or two of the programme or file you're looking for, and Quicksilver brings up a list. Quicksilver is one of those little programmes that melds seemlessly into daily life; if I'm ever on somebody else's Mac that doesn't have it installed, I miss it dearly. Cost: free.
Adium is a very Mac-like IM programme that handles all the major protocols like AIM, Yahoo, MSN Messenger, Jabber, etc. Cost: free.
YummyFTP is a powerful FTP programme. I've tried many different ones over the years, but this is my favourite. Cost: Around $20?
AppDelete addresses what's still a strange oversight with Apple's Finder: deleting a programme is easy (drag it to the trash) but it doesn't remove all the file associated with it. AppDelete attempts to do this. Cost: $5.
There are probably better VNC programmes than Chicken of the VNC, but none has a more awesome name or icon. Cost: free.
Apple has some good built-in programmes, too.
- Apple Mail is a solid mail programme.
- iCal (calendar) and Address Book are simple but handy. Both sync nicely with the iPhone, if you have one.
- iTunes is a pretty good music player and organiser, though it doesn't support FLAC.
- Preview is so much better than Adobe Reader for PDFs it's not funny.
- Time Machine is an automated back-up programme. It's not perfect -- if your computer stops working and you want to get a file out of Time Machine it whilst it's being repaired, you can't -- but it makes backing up a breeze. I still back up critical documents (my writing, etc) with other methods, but for a daily backup of everything on your system, it's hard to beat.
- Safari is a blazingly fast browser that's let down by one big issue: it doesn't remember your open tabs if it crashes. (Supposedly you can find an extension to make it do this but I couldn't get it to work.) So I would recommend Firefox.
Incidentally, Flash is way worse on the Mac than on the PC. It's a huge resource hog and I swear it still causes memory leaks, despite what Adobe says. Install Flashblock or ClickToFlash and set your browsers for HTML5 playback wherever possible.
Enjoy your new Mac!
Cheers.