The iPad supports .gif in Mail attachements...
Mail attachment support
- Viewable document types: .jpg, .tiff, .gif (images); .doc and .docx (Microsoft Word); .htm and .html (web pages); .key (Keynote); .numbers (Numbers); .pages (Pages); .pdf (Preview and Adobe Acrobat); .ppt and .pptx (Microsoft PowerPoint); .txt (text); .rtf (rich text format); .vcf (contact information); .xls and .xlsx (Microsoft Excel)
From here > iPad Tech Specs
Aside from mail, I don't think the .gif format is supported.
I think the problem is that the iPad may not support GIF images that move. It definitely can handle ordinary GIF photos, either by transferring from iTunes or via E-Mail.
If you have a computer program that can convert them to an M4V or MP4 movie, then you can transfer them to the iPad and view them in the Videos App.