Say it with pictures ....

Essential IT knowledge in Venn diagram form:

Figure 1 - Cost vs Benefit of customisation.
(click on image for larger size)

Figure 2 - Strategic value and software products.
(click on image for larger size)

Figure 3 - Innovation and software products.
(click on image for larger size)

Figure 4 - What is web 2.0?
(click on image for larger size)

Figure 5 - The relationships between SaaS, utility computing and virtualisation.
(click on image for larger size)

Figure 6 - What is SaaS?
(click on image for larger size)

Figure 7 - The SaaS vs Open Source argument in Full.
(click on image for larger size)

Figure 8 - The SOA vs Mashups argument in Full.
(click on image for larger size)

Figure 9 - The SOA vs ROA argument in Full.
(click on image for larger size)

Figure 10 - The Davenport vs Carr vs McAfee argument in Full
(click on image for larger size)

Figure 11 - Everything you need to know about portability.
(click on image for larger size)