I'm fairly new here, but thanks to MMM, my wife and I have had some serious discussion on how to improve our finances. We're both quite frugal (I married well!), but with five kids running around, it's pretty easy to spend money. Here are the changes we've made in the last couple months:
1) cancelled weekly semi-private swim lessons ($30/week) for our three oldest. We semi-private because our oldest is high-functioning Autistic, but we realized that swim lessons once per week wasn't resulting in noticeable progress for our kids. We'll wait until the summer, when we can enroll them in more intensive daily swim lessons, so they can learn better.
2) switched from Straight Talk to Airvoice Wireless. I looked at my actual texting/calling/internet history, and realized I could cut my bill from $50 to $25/mo at least. As it turns out, it'll be right around the $10/mo mark.
3) switched from Vonage to Ooma. When we started with Vonage, it was $25/mo. Nowadays, with all the taxes and stuff, it was $36. Ooma only costs the regulatory fees (about $4/mo) after the initial purchase. We do miss some of the features of Vonage--Ooma is pretty bare-bones--but we'll be ok without them.
4) put the thermostat back on its schedule. Instead of a constant 68 in the winter, it goes down to 60 from 10pm to 5am. It's extra encouragement for me to get to bed at 10:00, and it warms up the house by the time I get up at 6:00.
5) replaced the nine (!) 60W incandescent bulbs in our front chandelier with CFLs. Went from 540W to 117. Most of the other bulbs in the house are already CFLs.
Now, I just need to convince my bosses to move the company to a state with lower property and income taxes. Illinois is ridiculous.