Computer networking equipment maker Cisco Systems and Microsoft have made charitable donations and posted links on their sites' front pages directing users to charities. Microsoft pledged $3.5 million in disaster relief -- $2 million in aid to relief groups and another $1.5 million it projects will result from matching employee donations, according to a company release. In similar fashion, Cisco is donating in excess of $3 million in "humanitarian and rebuilding efforts."

Amazon customers, meanwhile, have given the American Red Cross more than $14 million, according to Amazon's website, while Yahoo customers have brought in about $4.7 million for the charity through Yahoo's U.S. homepage.

Auction giant eBay is also playing a part in alleviating damage caused by the natural disaster. The company has donated an undisclosed amount to disaster relief and employees are encouraged to give funds that will be matched by eBay, company spokesman Chris Donlay said.

In addition, eBay's 125 million users have a chance to help out through the site's Giving Works program, which lets sellers donate a chosen percentage of their item's sale price to charity.

Some companies, like iPod PocketDock creator SendStation Systems and online cell phone ring tone store ZaptoPhone, are selling products with the proceeds going, in part or in whole, to helping tsunami victims. ZaptoPhone's site currently hawks four different Tsunami aid ring tones. Consumers can buy the Thai, Indian, Sri Lankan and Indonesian national anthems, each costing between $2 and $9. Proceeds will be donated to UNICEF's tsunami relief efforts, according to the site. ZaptoPhone did not return a call for comment.

SendStation Systems' site, meanwhile, promotes the company's contribution of $5 from the sale of each iPod PocketDock at its online store to charity until the end of January.

Not all tech companies' aid efforts have been concentrated online, however. Electronics retailer Best Buy is matching in-store customer contributions up to a $1 million total. The company started this matching effort Jan. 1, and by Jan. 3 had collected more than $87,000, company spokeswoman Dawn Bryant said.