Ways In Which VPS Accounts Distinguish Themselves

I compiling a list of ways that vps accounts differ from normal shared hosting, both for myself and other vps newbies (will be published as an article)

I realise not all of these are limitation on all shared hosting accounts or indeed availabale on all vps accounts, but they represent the general rules for each.

So far I have:-

i) high or unlimited number of simaltanious processes.

ii) self setting process time out

iii) high or unlimited simaltanious pop3 account access

iv) guarenteed ram, process access and connectivity

v) high or unlimited email sending allowance (subject to usual spam policies)

vi) unlimited domains

vii) resource allocation per domain

anything else...speciaically im looking for way that shared hosting account are usually limited (like with the above mentioned simaltanious processes) that is not normal for vps accounts.