If you need a Linux virtual private server (VPS) for a test House of Linux recommends you ChunckHost. They are looking for Beta testers for their Xen servers, you will get a Free VPS with 512mb of ram memory, 20gb of virtual hard drive, and 600gb of mothly traffic out.
They currently have the following Linux distributions images available:
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CentOS 5.6
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CentOS 6.2
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Debian 5 Lenny
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Debian 6 Squeeze
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Ubuntu 10.04LTS
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Ubuntu 10.10
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Ubuntu 12.04LTS