There are several sets of ‘standard’ documents which you can consider using or at least reviewing and using as a comparison to a term sheet you get.  
1) Y Combinator Series AA: http://ycombinator.com/seriesaa….

2) Series Seed: http://www.seriesseed.com/posts/…

3) TechStars: http://www.techstars.org/2009/02…

Yokum Taku does a great job at comparing them and explaining pros and cons of using these vs. using a lawyer: http://www.startupcompanylawyer…. 
The cool thing about these 3 sources is that they are a set of documents, i.e. they can take you from term sheet and all the way through to closing the investment round. 
For a bit more complex and later stage docs you can see:

 4) Wilson Sonsini term sheet generator:
http://www.wsgr.com/wsgr/display… 

5) Orrick term sheet generator:
https://tsc.orrick.com/default.aspx 

6) The Funded: http://www.thefunded.com/funds/i… (also a full set of docs).

If you want more reading on this topic you can also check out these links: 
http://techcrunch.com/2008/08/13… 
http://www.seriesseed.com/posts/… 
http://www.startupcompanylawyer…. 

There was quite a debate back in Q2 2009 around this topic and you’ll be able to find lots of views from then. Reading these articles helps get a really good understanding of the contents of the docs and you can then form your own view on how you take your funding documentation process forward.