I use SSMS Tools Back by Mladen Prajdic

http://www.ssmstoolspack.com/

Way cheaper than redgate, and I get quite a bit out of it. I find the most useful feature is the snippet generator. I can bind tiny character strings to generate large, commonly used template code. For example, creation of temp tables, I bound "TT" + <TAB> to generate

if object_id('tempdb.dbo.#<TableName, sysname, >') is not null drop table #<TableName, sysname, >

create table #<TableName, sysname, >

(

)

It also has code formatting features (such as converting keywords to/from upper and lower case) and stores off history of query windows; very nice when you've been writing code for an hour and your computer crashes.