One of the things that the PowerShell team has always pointed out is the importance of naming conventions in functions.
Most of the bult-in PowerShell functions have a verb-noun format i.e. get-process, get-service etc..
Keeping things consistent across the different types of providers helps with the learning process as you can almost guess what a cmdlet would be called once you know the noun.

Up to now I thought this was just a syntax sugar but this blog entry from the main PowerShell guy Jeffrey Snover points out an important benefit if you name your functions correctly.
When you type a function name, and PowerShell tries to match the correct code to call, it will automagically add a get- to the function name and try to match on that if it fails to find a function of the exact name.

Heres an example take the simple get-SPSite function

function get-SPSite([string]$url)
{
   new-object Microsoft.SharePoint.SPSite($url)
}

I've been using this as $a=get-spsite "http://server" but I could have used $a=spsite "http://server". Its a small thing but if you're typing on the command those extra four characters add up plus it almost looks like C# code not having to use a lengthy namespace prefix.

Likewise for get-SPWeb

function get-SPWeb([string]$url)
{
   $site=new-object Microsoft.SharePoint.SPSite($url)

   $site.OpenWeb()
}