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My problem is my software on the instances uses a set of HTTP proxy servers to connect to the internet. I can only have ten IP addresses on the access list. Can a load balancer be used for outbound traffic like this?
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My problem is my software on the instances uses a set of HTTP proxy servers to connect to the internet. I can only have ten IP addresses on the access list. Can a load balancer be used for outbound traffic like this?

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You should have described your problem in more detail when asking :)<br />
A load balancer is no good in your case. <br />
You can easily set up a proxy (one or more) controlled by you in EC2. Either Apache http with mod_proxy, or squid, or any other you like, can be used to consolidate your outgoing traffic thru this single IP address. 
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You should have described your problem in more detail when asking :)
A load balancer is no good in your case.
You can easily set up a proxy (one or more) controlled by you in EC2. Either Apache http with mod_proxy, or squid, or any other you like, can be used to consolidate your outgoing traffic thru this single IP address.

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I need to assign a single IP address to multiple AWS instances. How can this be done?
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I need to assign a single IP address to multiple AWS instances. How can this be done?

AWS - Assign one IP to multiple instances

Cloud computing, also known as on-demand computing, is a kind of Internet-based computing where shared resources and information are provided to computers and other devices. It is a model for enabling ubiquitous, on-demand access to a shared pool of configurable computing resources. Cloud computing and storage solutions provide users and enterprises with various capabilities to store and process their data in third-party data centers, relying on sharing of resources to achieve coherence and economies of scale.

Cloud Computing

Amazon Web Services (AWS), is a collection of remote computing services, also called web services, that make up a cloud-computing platform  operated from 11 geographical regions across the world. The most central and well-known of these services include Amazon Elastic Compute Cloud, also known as "EC2", and Amazon Simple Storage Service, also known as "S3". Other services include Elastic MapReduce (EMR), Route 53 (a DNS web service),  provides a highly available and scalable Domain Name System (DNS) web service, Virtual Private Cloud (VPC), storage, database, deployment and application services.