site foundation

html5 / css3 / responsive design
.net / asp / php
social media integration
facebook / twitter / etc
javascript / jquery / etc
search engine optimization (seo)
email setup and configuration
domain / web host
recommend and configure
performance - page speed
analytics
testing across browsers and platforms
forms

email, newsletters, blogs

rss feeds
custom wordpress blogs
contact management integration
forms to icontact,etc

ecommerce / content management systems (cms)

secure logins
database
ssl certificate management
data encryption
payment system integration
custom storefront, shopping cart, checkout

additional considerations

test servers
integration of 3rd party tools
client training
ongoing maintenance