Not surprisingly, there are audio options out there to get just your voice onto your site, although these aren't as prevalent as video and images.
Ovi Share supports audio files, and you can set it up to distribute podcasts too if you use this address for your feed:
feed://share.ovi.com/feeds/podcast/channel/yourname.podcast
While we're on the topic, after digging here's a list of all the file types supported by Ovi Share:
Supported file types: 3g2, 3gp, 3gp2, 3gpp, 3gpp2, aac, aif, aifc, aiff, amr, asf, asr, asx, au, avi, bmp, cad, cmx, cod, css, dib, doc, dot, dtd, dwf, fla, flv, gif, ico, ief, ifo, ipx, jfif, jpe, jpeg, jpg, kml, kmz, lsf, m1a, m1v, m3u, m4a, m4p, m4v, mdi, mid, midi, mov, movie, mp2, mp3, mp4, mpa, mpe, mpeg, mpg, mpp, mpv2, mqv, nsc, odf, odg, odp, ods, odt, ogg, pbm, pdf, pgm, png, pot, ppm, pps, ppt, psd, pub, qt, ra, ram, ras, rgb, rm, rmi, rtf, rtx, scd, snd, swf, tif, tiff, tsv, txt, vsd, vss, vst, vsx, vtx, wav, wax, wbmp, wm, wma, wml, wmp, wmv, wmx, wri, xbm, xla, xlc, xlm, xls, xlt, xlw, xml, xsd, xsl, xslt.
...in other words pretty much every media type including text documents and spreadsheets. I'm not sure how many of these can be viewed through the website though.