iThoughts HD - The best Mind-mapping application out there.

Simplenote - synchronise text files across all your computers.

Instapaper - nice for storing webpages to read later

Skitch- image manipulation and annotating, taking screenshots and making quick diagrams

PDF Expert - annotating PDFs on the go, syncs with DropBox

Dropbox - great for backing up all your files automatically. It works also with iPhones, iPads if you have one, and keeps everything in sync

Evernote - For gathering medical information from the web itself for later review I use a great application called Evernote (www.evernote.com). I can add voice memos, clip webpages, add text notes, photos, journal articles in PDF format and much more besides. I use it during conferences too. I plan which sessions to attend by storing the scientific programme and abstracts within it. It's fully searchable and is available on Mac/PC/iPad, plus many smartphones, so your notes and clippings are always available to you

BBC iPlayer and BBC News apps

Byword - great on the go wordprocessor, syncs with Mac

FlightTrack - view flight status, select the best seats on the plane

GarageBand - play musical instruments on the iPad

Kindle - allows you to read and buy Kindle-format books on your iPad

Medcalcpro - more medical equations than is healthy in one place

Papers - all your PDFs in one place

TripAdvisor - good for hotel recommendations

Twitter - I use Echofon

Journals with iPad editions - Circulation, NEJM, Lancet

Heart Pro 3 - amazing detailed images of the heart to show patients

Skype - free Internet calls and videos

Omnifocus - expensive but brilliant productivity and To Do list manager. Steep learning curve but very effective