Maximum connections are limited to 32,767 for both SQL 2008 and SQL 2005 and you can edit that from your server properties tab, but I do not suggest you modify it unless otherwise there is a specific need for a dedicated connection.
I suggest you do a thorough reading on BOL or try to google it before you make any changes..
HTH...
The_SQL_DBA
MCTS
"Quality is never an accident; it is always the result of high intention, sincere effort, intelligent direction and skillful execution; it represents the wise choice of many alternatives."