For most roth ira plans, is there a minimum amount of $$ I need to contribute per month? Or can I put in as little each month as I want?

Citrus8:

Generally, there is NO monthly minimum. For 2005, the annual contribution limit is $4,000. You can contribute it all at once on April 15, 2006 (the last day you can set up a Roth IRA for 2005), or you can contribute nothing, or any amount in between.