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Get The Hotlist with the touch of a button and Bing wants you to know how much to bring for the cab ride. Clearwire is expanding its 4G horizon and Amazon wants to write the soundtrack for what remains of summer.

Handheld Hotlist

Online-based social event coordinator “The Hotlist” is known for its ability to instantaneously coordinate Friday night plans for you and your friends. The site works with real-time updates from the likes of Google, Facebook, Twitter and Yelp. The best part? Now you no longer have to log on using your laptop and firing up your WiFi to find out what’s happening this weekend. The Hotlist now has an iPhone app; find it for free at the iPhone app store.

And with iPhone’s uncanny ability to decipher where you are at any given time, you can just use your “current location” to find the nearest party. Add to that Twitter’s 100 million users and Facebook’s 500 million users, you’re bound to find something fun to do.

Cab Calculator

Microsoft’s (NASDAQ:MSFT) Bing.com is adding a little extra boost to its search capabilities. The site now carries a cab fare calculator via its Maps tool. All you have to do is go to Bing.com and click on “Map apps” to find the taxi fare calculator.

Click the app and select your region. Then type in your starting address and final destination and you’ll get an estimate to see just how much cash you have to take out of the ATM before your trip.

4G Full Throttle

Clearwire Corp.’s (NASDAQ:CLWR) 4G network is branching out even more, taking on the markets in four states – California, Florida, Delaware and Michigan.

That makes a total of 48 markets for the company’s WiMax technology. Clearwire says it expects to reach up to 120 million people by the end of this year. See if it’s available via your favorite provider: Sprint,(NYSE:S) Comcast, (NASDAQ:CMCSA) and Time Warner Cable (NYSE:TWC)are all distributors.

Shout It Out

In a world where every communication is being boiled down to just 140 characters or less, who needs an entire one-page letter of recommendation? Apparently that’s what Sawhorse Media of Brooklyn, New York is thinking with its new venture “Shoutworthy.” Shoutworthy is a social app that lets you “shout out” messages to sing the praises of your friends and co-workers. Love the new café your former classmate just opened down the street? Shout it out and attach a link. Just remember to keep it short (and sweet.)

Cash, Credit, or Mobile?

We all know what a payphone is (though they’ve been disappearing since the cell phone went mainstream.) But do you know what Payfone is? The company has been around for three years, but it’s been gaining momentum and support from investors. 

Payfone is all about mobile payment processing, letting users buy what they want by way of their mobile phone. You’ll get a receipt in the form of your monthly billing statement. You’ll want to keep an eye on this one.

Amazon Songs

Amazon.com (NASDAQ:AMZN) is offering select MP3 albums for just $5. Lady Gaga has been touring her way around the nation; if you got to see her perform and can’t seem to get her songs out of your head, download the whole album  for just a fraction of what you paid for your ticket. Not a Gaga fan? There are more than a thousand other collections that are sure to please.

Know of a killer deal or insane bargain? E-mail the goods to OnSale@FOXBusiness.com, or follow us on Twitter at OnSale_FOXBiz, and share the wealth.